melanotic macule of matrix macule. Benign. Dark spot on labia (or lip). Analogous to lentigo simplex. Hyperpigmented basal keratinocytes & dermal melanophages. Slight ⬆️ in single basal melanocytes; NO nests. More info like this in Figure 2 from Clinicopathologic features
Figure 2 from Clinicopathologic features of 28 cases of nail matrix nevi (NMNs) in Asians: Comparison between children and adults Semantic Scholar The Art of Nail Findings in Patients with Skin of Color Next Steps in Dermatology Pigmented Nail Disorders Basicmedical Key Pathology Outlines Melanotic macule Diagnosing And Treating Pigmented Nail Lesions Melanotic macule of nail unit and its clinicopathologic spectrum ScienceDirect
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