Melasma: A Step-by-Step Approach Towards a Multimodal Combination Therapy

Wolfgang G Philipp-Dormston

doi:10.2147/CCID.S372456

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Review

Melasma: A Step-by-Step Approach Towards a Multimodal Combination Therapy

Authors Philipp-Dormston WG

Received 12 January 2024

Accepted for publication 25 April 2024

Published 22 May 2024 Volume 2024:17 Pages 1203—1216

DOI https://doi.org/10.2147/CCID.S372456

Checked for plagiarism Yes

Review by Single anonymous peer review

Peer reviewer comments 3

Editor who approved publication: Dr Jeffrey Weinberg

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Wolfgang G Philipp-Dormston^1,²

¹Hautzentrum Köln/Cologne Dermatology, Cologne, Germany; ²Faculty of Health, University of Witten/Herdecke, Witten, Germany

Correspondence: Wolfgang G Philipp-Dormston, Hautzentrum Köln/Cologne Dermatology, Schillingsrotter Str. 39-41, Cologne, 50996, Germany, Tel +49 221 39800 200, Fax +49-221-39800 201, Email [email protected]

Abstract: Melasma is a common challenge in the field of pigmentary skin disorders, exerting a significant emotional and psychosocial burden on patients. The persistent and recurring nature of melasma complicates its management in routine clinical practice. This comprehensive review outlines a stepwise, practical approach encompassing diagnostic, preventive and therapeutic strategies for the management of melasma. A thorough exploration of aggravating and exacerbating factors, including sun exposure, hormonal imbalances, photosensitizing medication and cosmetics, is essential for a holistic assessment of the disease. With an emphasis on consistent and effective photoprotection, initial topical treatment modalities target the melanin production and/or the transfer of melanosomes to keratinocytes. Topical tyrosine inhibitors emerge as the first choice for reducing and preventing hyperpigmentation, with compounds such as thiamidol or tranexamic acid (TXA) being preferred for their safety profile over hydroquinone (HQ), kojic acid and arbutin. Combination with chemical peels can further enhance the therapeutic efficacy, even in cases with resistant melasma. In more severe cases, laser- and light-based interventions may be considered, but with the caveat of the likelihood of recurrence within 3– 6 months. Assisted TXA delivery, via either fractional non-ablative laser or microneedling techniques, can further improve clinical outcomes. In conclusion, an optimal melasma management strategy is a multimodal approach, which includes effective photoprotection and a mix of different topical treatments targeting melanin synthesis, the anti-inflammatory environment, senescence and vascularity. Complementary procedures, such as chemical peels, and laser, light-based or microneedling procedures, with or without TXA, can further expedite melanin clearance in more severely affected instances. Individual discussions with patients regarding treatment expectations, recurrence likelihood and potential side effects are paramount to a comprehensive and successful therapeutic journey.

Keywords: melasma, chloasma, hyperpigmentation, melanosis

Introduction

Melasma (syn. chloasma) presents as distinct, symmetrically patterned, hyperpigmented patches or small spots that occur predominantly on sun-exposed areas of the face. While its predominant location is generally centrofacial, affecting 50–80% of cases, melasma can also manifest on malar and mandibular areas.^1,2 The prevalence of melasma exhibits striking variability across populations and ethnicities, with reported overall prevalence rates ranging from of 1% in the general population to as high as 9–50% in high-risk populations, particularly dark-skinned women (Fitzpatrick phototypes III–IV) in their third and fourth decades of life.³

Despite being a common and predominantly benign condition, melasma carries a considerable emotional and psychosocial burden, profoundly affecting the patient’s self-esteem and overall quality of life.^4,5 Given its persistence and recurring nature, effectively managing patient expectations and implementing preventive and therapeutic interventions tailored to the severity and underlying pathophysiology are paramount. However, reviews providing a practical treatment pathway for the management of melasma are limited.

This comprehensive review outlines a stepwise, up-to-date practical approach encompassing diagnostic, preventive and therapeutic strategies for the management of melasma to facilitate its management in everyday clinical practice.

Understanding Pathophysiology and Aggravating Factors

The pathogenesis of melasma is multifactorial and not yet fully understood; various internal and environmental factors can contribute to triggering, maintaining and the relapsing of lesions^6,7 (Table 1). Among these, the most important factors are genetic predisposition, sun exposure and hormonal imbalances, especially as they occur in the context of pregnancy (“mask of pregnancy”) or when taking contraceptives. All of them can significantly increase tyrosinase activity. In addition, chronic inflammatory skin diseases, photosensitizing interventions, drugs or food, liver diseases, ovarian tumors, helminthiasis, and even increased stress can cause melasma.⁸

Table 1 Factors Contributing to Melasma Pathogenesis and Diagnostic Work-Up

As a concomitant disease, melasma is more often diagnosed in patients with polycystic ovary syndrome, insulin resistance or thyroid dysfunction. Furthermore, 76% of patients report depressive or stress symptoms, which may, at least partially, be caused by hormonal imbalances as well.^3,9

Diagnostic Work-Up

The diagnosis of melasma is primarily based on its clinical presentation; however, it is important to carefully investigate aggravating and triggering factors by obtaining a detailed history of the patient (Table 1) and to rule out other pigmentary disorders, which can mimic melasma.

Familial predisposition is the most important risk factor for melasma, and nearly 300 genes have been identified to be differentially expressed in the skin lesions of melasma. However, no Mendelian pattern of inheritance has been identified yet.¹⁰ The clinical diagnosis can be further confirmed by dermatoscopic examination, showing typical pronounced hyperpigmentation in the pseudo-rete ridges of the skin,¹¹ or an accentuated, epidermal hyperpigmentation, when using Wood’s lamp.¹² Reflectance confocal microscopy (RCM) is another non-invasive technique, showing activated melanocytes and melanophages as well as solar elastosis at a cellular level of resolution.^13,14 Dynamic optical coherence tomography (D-OCT) can be used to study changes in cutaneous blood vessels in melasma before or during treatment.¹⁵ Based on the individual history of the patient, further laboratory tests, such as sex hormones, thyroid and liver function tests, adrenocorticotropic hormone, cortisol, complete hemogram and stool examination, may be conducted as well (Table 1).

The main differential diagnoses for melasma include ephelides, lentigines, post-inflammatory hyperpigmentation, phototoxic dermatitis, including phytophotodermatitis, and drug-induced pigmentation. In rare cases, lichen planus pigmentosus, discoid lupus erythematosus, erythema dyschromicum perstans, pigmented contact dermatitis, poikiloderma of Civatte, erythromelanosis follicularis faciei, ochronosis, Hori’s nevus, argyria, nevus of Ota and macular amyloidosis can also mimic a melasma-like clinical picture.⁷

Management of Melasma: Practical Guidance

The therapeutic management of melasma is challenging because of its chronic and recurring nature. It includes topical, oral and procedural treatments targeting various aspects of the pathogenesis, including ultraviolet (UV) damage, hyperpigmentation, inflammation and vascularization (Figure 1, Table 2).^16–19

Figure 1 The main principles of topical melasma treatment include the inhibition of melanin synthesis pathways.

Abbreviations: AHA, alpha-hydroxy acid; DNA, deoxyribonucleic acid; m-RNA, messenger ribonucleic acid.

Table 2 Overview of Commonly Used Topical or Oral Therapies and Their Mode of Action in Melasma*

Tyrosinase Inhibitors

Tyrosinase inhibitors, such as hydroquinone, thiamidol, kojic acid, arbutin, n-butylresorcinol and azelaic acid, competitively inhibit the conversion of 1-3,4-dihydroxyphenylalanine to melanin and are the most targeted dermocosmetic solution to reduce and prevent hyperpigmentation (Table 2).

Historically, hydroquinone (HQ) 4% as monotherapy, but also in combination with tretinoin and topical steroids (“triple cream”), has been an established topical, first-line treatment over years, but concerns about its side effects (permanent depigmentation, ochronosis, potential risk of cancer due to its metabolites) have prompted the use of potentially safer alternatives and the withdrawal of HQ in many countries.^53,54 Notably, most of the “older” tyrosinase inhibitors were previously tested using an in vitro mushroom tyrosinase model, but showed only limited efficacy in inhibiting the human tyrosinase, while thiamidol 0.2% was identified as being the most effective inhibitor of the human tyrosinase, corresponding to its good clinical efficacy^68–71 (Figure 2).

Figure 2 Inhibition of human tyrosinase by various concentrations of thiamidol, 4-butylresorcinol, kojic acid, arbutin and hydroquinone using an in vitro assay with purified human tyrosinase.

Notes: Adapted from Arrowitz C, Schoelermann AM, Mann T, Jiang LI, Weber T, Kolbe L. Effective tyrosinase inhibition by thiamidol results in significant improvement of mild to moderate melasma. J Invest Dermatol. 2019;139(8):1691–1698.e6 © 2019, Creative Commons.⁶⁹

Besides the inhibition of tyrosinase activity, tranexamic acid (TXA) has additional anti-pigmentary, anti-inflammatory and anti-vascularization properties. It prevents plasminogen binding to keratinocytes, reduces melanocyte-stimulating hormone (MSH), reduces the concentration of arachidonic acid, prostaglandins and leukotrienes in keratinocytes, and is one of the very few methods that inhibits angiogenesis, through the suppression of vascular endothelial growth factor (VEGF) and endothelin-1 (EDN1). TXA can be used orally, topically or via an injection as part of mesotherapy or microneedling.^72–87 Whereas topical TXA 5% was well tolerated in clinical studies, several side effects, including oligomenorrhea, gastrointestinal discomfort, headache and transient skin irritation, were reported with oral TXA; in addition, a possible increased risk of thromboembolism needs to be considered.⁶ Therefore, owing to the limited amount of data on the safety of oral TXA, topical or delivery-assisted TXA application should be preferred in melasma patients.

Retinoids

Topical retinoids, including tretinoin 0.05–0.1%, adapalene, tazarotene, isotretinoin and retinol, regulate the differentiation, proliferation and apoptosis of cells by binding to nuclear receptors (Table 2). They inhibit the transcription of tyrosinase and melanin synthesis and reduce oxidative stress by inhibiting the activation of the matrix metalloproteinase. In addition, they reduce the transfer of melanosomes to keratinocytes and accelerate melanin loss as a result of an increased turnover of keratinocytes and their exfoliative properties. When used in combination, they may enhance the transepidermal penetration of other topical medications.^{6,20–31,130–133} However, retinoids are known to be slow-acting substances, and it may take up to 24 weeks to see clinical benefits in melasma.²⁰ In addition, the risk of secondary hyperpigmentation due to retinoid-induced irritation needs to be considered in melasma.

Niacinamide

Niacinamide (4%), alone or in combination with retinoic acids, inhibits melanosome transfer to keratinocytes and has been shown to decrease pigmentation in melasma within a period of 8 weeks^115,116,155 (Table 2).

Antioxidants

Ascorbic acid protects the skin from oxidative stress by neutralizing free radicals, as it is a potent electron donor. In addition, it interacts with the copper ions at the active site of the tyrosinase enzyme and reduces its activity.^100–108 Topical application of ascorbic acid and zinc has been shown to improve skin lesions in melasma, with only very few side effects.¹³⁴ Other topical natural antioxidants, such as Korean red ginseng, ferulic acid, and orchid or parsley plant extracts, can improve melasma, as can orally taken antioxidants, such as pycnogenol^{111–113,135,136} (Table 2).

Chemical Peels

Chemical peels are typically used as a second-line treatment procedure in the management of melasma.^19,137–139 Chemical peels can improve melasma by reducing melanin and melanosome transfer owing to their exfoliative properties and by inducing the phagocytosis of melanin. When used in combination with local treatment or laser therapy, they can enhance and accelerate the therapeutic effects, even in the case of resistant melasma.^19,137 However, they should be used with caution, especially in people with darker skin types, because of the risk of post-inflammatory hyperpigmentation.^138,139

Laser, Light-Based and Microneedling Techniques

Laser- and light-based therapies, such as intense pulsed light (IPL), Q-switched low-fluency lasers, non-ablative fractional lasers (NAFLs) or picosecond lasers, can accelerate the removal of melanin and lead to more rapid improvement in patients. However, all of these methods are not causative, as they do not have any direct or indirect effect on melanin synthesis. The risk of recurrence and, with some techniques, the risk of post-inflammatory hyperpigmentation or hypopigmentation has to be considered and explicitly explained to patients.⁶

NAFLs may provide a more effective and sustained response, with recurrence after 3–6 months, whereas in IPL or Q-switched laser treatments skin lesions appear usually within 3 months after the procedure. The 1927nm wavelength allows practitioners to treat Fitzpatrick skin types III–VI as well, which is not the case for IPL and Q-switched lasers. Combination with a topical tyrosinase inhibitor, applied before and after the NAFL, can further enhance long-term improvement.^139–144

Picosecond lasers generate pulses in the picosecond domain, which leads to a mainly photoacoustic-driven melanin fragmentation without causing thermal damage to the surrounding tissues, which may enhance the efficacy and safety properties of this method in treating melasma. The use of picosecond lasers with diffractive lens arrays may, in addition, alleviate related photoaging characteristics, and the effects may be maintained for a longer time.^145–149

Microneedle radiofrequency (RF) creates microscopic channels to the required depths of the dermis, so that thermal energy can stimulate the production of collagen and elastin. As a result of this controlled skin injury, keratinocyte turnover is accelerated, which leads to increased melanin removal as well as to decreased blood vessel proliferation and restoration of the basement membrane. Owing to its additional benefits on solar elastosis and skin aging, combined with an excellent safety profile, microneedle RF may be beneficial as adjunct melasma therapy.¹⁵⁰

Topical TXA, alone or in combination with either a fractional CO₂ laser or microneedling, achieved better results than when used alone, but there was no difference between the laser and microneedling techniques.^151,152 Hence, a combination of microneedling or a fractional CO₂ laser with topical TXA 5% may be another treatment alternative for melasma, resulting in better treatment outcomes than the single use of substances or procedures.¹⁵¹

Prevention by Photoprotection

Visible light, especially high-energy visible light (HEVL), and UVA (UVA1) radiation are the main causative triggers for melasma,¹⁴⁸ and the avoidance of and protection against UV radiation and visible light are critical for the sustained control of melasma. Therefore, the use of a broad-spectrum UVA/UVB sunscreen with a high sun protection factor (SPF 30+) and high protection against UVA1 and HEVL all year round should be recommended to all melasma patients. In choosing suitable sunscreen, the combination of broad-spectrum UVA and UVB filters with visible light blockers, such as iron oxide, should be favored, as such combinations showed better results in prevention of melasma flares compared to broad-spectrum UV filters alone.^19,153–155

Introducing a Step-by-Step Multimodal Treatment Approach for Melasma

Single treatment approaches are, in general, of limited efficacy for the long-term management of melasma. Hence, a step-by-step, multimodal approach, which includes a mix of treatments and procedures targeting the melanin synthesis pathways, the anti-inflammatory environment, senescence and vascularity, should be used, along with avoidance of exacerbating factors such as UV light and hormonal contraception (Figure 3).^16,17

Figure 3 Management of melasma: a practical approach for a stepwise combination therapy.

Abbreviations: TXA, tranexamic acid; NAFL, non-ablative fractional laser; UV, ultraviolet; HEVL, high-energy visible light; SPF, sun protection factor.

In addition to consistent and effective photoprotection, topical treatments that inhibit the melanin synthesis pathway should be considered as first-line therapies for melasma.^6,18 The use of effective and potentially safer topical tyrosinase inhibitors, such as thiamidol or TXA, should be preferred (Figure 4). HQ, arbutin and kojic acid-containing topicals are no longer recommended because of the risk of side effects and the availability of safer alternatives. Combination with topical retinoids and/or niacinamide could be considered to target tyrosinase transcription, melanin synthesis, vascularization and oxidative stress. This can be further enhanced by antioxidants or mesotherapy as adjunct treatment.

Figure 4 Melasma at baseline (A) and after 12 weeks (B) of treatment with the topical tyrosinase inhibitor thiamidol and subsequent sunscreen use.

Notes: Adapted from Philipp-Dormston WG, Vila Echagüe A, Pérez Damonte SH, Riedel J, Filbry A, Warnke K, Lofrano C, Roggenkamp D, Nippel G. Thiamidol containing treatment regimens in facial hyperpigmentation: An international multi-centre approach consisting of a double-blind, controlled, split-face study and of an open-label, real-world study. Int J Cosmet Sci. 2020;42(4):377–387. © 2020 Beiersdorf AG. International Journal of Cosmetic Science, published by John Wiley & Sons Ltd on behalf of the Society of Cosmetic Scientists and Société Française de Cosmétologie.⁷¹

Combining topical treatments with chemical peels may further enhance and accelerate therapeutic effects, even in resistant melasma.¹⁹ In more severe and refractory cases, lasers and light-based therapies may be suggested, but patients must be prepared for a high recurrence rate. The combination of fractional CO₂ laser or microneedling techniques with TXA may further improve clinical outcomes.¹⁵²

This comprehensive review is limited by its narrative methodology. It summarizes recent developments in melasma treatment for developing a step-by-step treatment approach for use in everyday clinical practice. It does not replace a systematic review, with a structured assessment and weighting of the individual studies and treatment strategies, and may lack completeness. Recent systematic reviews, however, were considered when available. National and international treatment recommendations are needed to further improve and standardize the management of such a common disease as melasma.

Conclusion

The treatment of melasma remains challenging owing to its chronic and recurrent nature. Its multifactorial etiology implies the use of a multimodal approach that includes a mix of different topical treatments targeting the melanin synthesis pathways, the anti-inflammatory environment, senescence and vascularity, along with avoidance of exacerbating factors, such as UV light and hormonal contraception. Complementary procedures, including chemical peels, lasers, light-based or microneedling procedures, with or without TXA, can further expedite melanin clearance in more severely affected instances. This comprehensive review outlines a step-by-step clinical approach based on recent evidence encompassing diagnostic, preventive and therapeutic strategies for the management of melasma to facilitate its management in everyday clinical practice. Individual discussions with patients regarding treatment expectations, recurrence likelihood and potential side effects are paramount to a successful therapeutic journey.

Acknowledgments

The author thanks Dr. med. Michaela Dippel (MD medscript & consult, Wachenheim, Germany) for medical writing support, sponsored by Beiersdorf.

Disclosure

WGPD has served as a consultant, speaker or investigator for Beiersdorf (Eucerin), Benevi, Eco Elio, Galderma, L’Oréal (La Roche Posay, SkinCeuticals), and Pierre Fabre (Avène). The author reports no other conflicts of interest in this work.

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