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Pigmented Follicular Cyst
Pigmented follicular cysts, described by Mehregan and Medenica, are usually solitary and occur primarily on the face of men. They are often deeply pigmented and may be confused clinically with a melanocytic nevus.
Histologically, these cysts have a pore-like connection to the epidermis, are lined by stratified squamous epithelium that includes a granular layer, and contain pigmented hair shafts. The clinical presentation, epidermal connection, and pigmented terminal hair shafts rather than vellus hair shafts distinguish the pigmented follicular cyst from vellus hair cysts.