Disorders of Pigmentation and Melanocytes. (A) Increased epidermal pigmentation and dermal melanophages in the lesional skin (L) compared with perilesional normal skin (N) (Fontana-Masson staining, ×200). (B) There were no melanocytes in the dermis (gp100, ×200). Imatinib mesylate-induced hyperpigmentation of the nose and palate: Song HS, Kang HY - Annals of dermatology (2014). Not altered. CC.