Sebaceous Gland Carcinoma is a rare kind of skin cancer that causes serious complications. Even though sebaceous glands are present almost everywhere on the body, the cancer usually affects the eyelids. Sebaceous Gland Carcinoma is a malignant condition. Hence it can spread to surrounding tissues of the body.
https://www.primehealthchannel.com/sebaceous-glands-location-functions-and-pictures.html

