Laboratory Studies
Usually, no laboratory tests are indicated for melasma. Consider checking thyroid function test results. Wood light examination usually helps to localize the pigment to the epidermis or the dermis. Note that in many cases, the pigment is found in both locations.[7]
Histologic Findings
Melanin is increased in the epidermis, in the dermis, or (most commonly) in both locations in melasma patients. Epidermal melanin is found in keratinocytes in the basal and suprabasal area. In most cases, the number of melanocytes is not increased, yet the melanocytes that are present are larger, more dendritic, and more active. Dermal melanin is found in the superficial and mid dermis within macrophages, which often congregate around small, dilated vessels. Inflammation is sparse or absent.
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