Update on Melasma-Part I: Pathogenesis

Area of Science:

• Dermatology
• Pathogenesis of Skin Disorders

Background:

• Melasma is a multifactorial dyschromia influenced by genetic predisposition, external factors (solar radiation), hormonal influences (sex hormones, pregnancy), and skin inflammation.
• Affected skin displays hyperfunctional melanocytes and structural/functional alterations in the epidermis, basement membrane, and upper dermis, contributing to a focal hypermelanogenic phenotype.

Purpose of the Study:

• To review current knowledge on the pathogenesis of melasma.
• To discuss the effects of specific treatments and future research directions.

Main Methods:

• Literature review of current scientific knowledge on melasma pathogenesis.
• Analysis of factors including genetics, solar radiation response, endocrine factors, antioxidant systems, and cellular processes.

Main Results:

• Melasma involves complex interactions between genetic susceptibility, environmental triggers, hormonal factors, and inflammatory processes.
• Alterations in melanocyte function, skin structure, and various cellular pathways (e.g., autophagy, paracrine regulation) are implicated.

Conclusions:

• Advancements in understanding the genetic basis, environmental responses, and cellular mechanisms of melasma are crucial.
• This knowledge will drive the development of novel preventive strategies and therapeutic interventions for melasma.