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Figure 4: Pathological photomicrographs of the patient's tumor. (a) Epidermoid with stratified squamous epithelial lining and keratin flakes (H and E, ×40). (b) Subepithelial connective tissue with abundant brownish melanin pigment in melanophages and mild pigment in basal layers (H and E, ×100). (c) Masson Fontana stain for melanin pigment (×100). (d) Melanin bleach staining (×100, D)

Figure 4: Pathological photomicrographs of the patient's tumor. (a) Epidermoid with stratified squamous epithelial lining and keratin flakes (H and E, ×40). (b) Subepithelial connective tissue with abundant brownish melanin pigment in melanophages and mild pigment in basal layers (H and E, ×100). (c) Masson Fontana stain for melanin pigment (×100). (d) Melanin bleach staining (×100, D)