Pigmented lesions of the oral mucosa and perioral tissues: a flow chart for the diagnosis and some recommendations for the management ScienceDirect COM Jan. 2008 Diagnosis UW School of Dentistry Black and Brown: Non neoplastic Pigmentation of the Oral Mucosa Head and Neck Pathology Springer Nature Link Figure 1 from Oral Melanosis Semantic Scholar Universal acquired melanosis (Carbon baby) Indian Journal of Dermatology, Venereology and Leprology Perioral Pigmentation One Area. Many Diagnoses. Dark skin around the mouth is one of the most common concerns I see in my OPD but it is never just tanning.