Melanin deposition and melasma differences

The distinction between melanin deposition and melasma mainly lies in their causes, distributions, and manifestations. Melanin deposition results from excessive production of melanin by melanocytes and its subsequent accumulation in epidermal keratinocytes. It may be triggered by various factors such as endocrine disorders, metabolic diseases, and nutritional deficiencies, and it manifests as localized or generalized darkening of the skin. On the other hand, melasma is a common pigmented skin condition frequently found on the face. Its causes are complex and include ultraviolet radiation, genetic predisposition, and endocrine imbalances. Melasma typically presents as light brown or dark brown patches on the face, which may be symmetrically or asymmetrically distributed. It commonly appears on the cheeks, forehead, and upper lip, often resembling a butterfly in shape, hence it is also known as chloasma or the "butterfly mask." If you have any concerns, please consult a relevant healthcare professional.