Hello,
It looks like small mole, benign growth like
seborrheic keratosis or a HPV wart.
Seborrheic keratosis is a benign skin growth and the cause is exactly not known but sunlight and hereditary predisposition have been proposed. The treatment methods employed are cryotherapy with carbon dioxide (dry ice) or liquid nitrogen, electrodesiccation, electrodesiccation and curettage, curettage alone, shave biopsy or excision using a scalpel, or a laser or dermabrasion surgery.