Dysregulation of the tyrosinase enzyme is the main cause of melanogenesis inhibition Hyperpigmentation is the darkening or increase in the natural color of the skin usually due to an increased deposition of melanin (hypermelanosis) Less frequently, it may be caused by the deposition in the dermis of endogenous or exogenous pigments, such as hemosiderin, iron, or heavy metals The excess of melanin in the basal and suprabasal layers of the skin is due to either an abnormally high number of melanocytes or a normal melanocyte population
No tolerance developed to this protective effect, which appeared to be mediated by (1) the activation of 5-HT 1A receptors, as it was antagonized by the administration of WAY100635 30 min before stress exposure
(Fig1) On dermoscopic examination revealed parallel pattern
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Thota RN, Dias CB, Abbott KA, Acharya SH, Garg ML