<unk>  is a neoplastic growth of<unk>  glands. It is predominantly seen in the head and neck region given the high density of<unk>  glands in this region. The periocular region, which includes the meibomian, Zeis, and<unk>  glands of the caruncle and eyelid, is the most common site accounting for up to 75% of SGc. Meibomian glands are a type of<unk>  gland that lines the upper and lower eyelids and do not contain a follicle. The glands of Zeis contain the individual eyelash. The upper eyelid contains more meibomian glands than the lower eyelid and consequently, SGc is 2-3 times more common in the upper eyelid. Periocular SGc most commonly presents as a yellow, hard, painless, subcutaneous nodule or papule, which may rapidly enlarge, and may be confused with chalazion, blepharitis, conjunctivitis, or other inflammatory conditions of the eye. Extraocular SGc accounts for approximately 25% of all SGc. commonly presents as a painless, red and brown or red and yellow, ulcerated papule on the head or neck and may mimic nonmelanoma skin cancers, molluscum contagiosum, adnexal neoplasms, or pyogenic granuloma. The mean lesion size of periocular and extraocular SGc is approximately 1.4 cm.
Sebaceous carcinoma
Medulloepithelioma
Lymphoepithelioma
Bartholin gland carcinoma
Basal-cell carcinoma
Trichoepithelioma
Pyogenic granuloma
Angiokeratoma