Is it a sebaceous cyst or a lipoma? (Photo)

As a dermatologist, I can provide some general information that may help you distinguish between a sebaceous cyst and a lipoma, but a definitive diagnosis would require an in-person examination, possibly supplemented by imaging studies or a biopsy.

Sebaceous Cyst: Typically, these are slow-growing, non-cancerous bumps beneath the skin that are filled with a white, oily substance. They often have a central opening or pore, although it might not always be visible. Sebaceous cysts can occur anywhere on the body, including the scrotum, and are usually firm to the touch.

Lipoma: This is a benign tumor composed of fatty tissue. Lipomas are usually soft, movable, and located just under the skin. They generally do not have an opening and are painless.

Scrotal Nodule: This term can refer to any lump or bump on the scrotum, which might include cysts, lipomas, or other types of growths.

Given that your lesion is firm, skin-colored, and has been present for 16 years without any discharge or opening, it could be either a lipoma or a sebaceous cyst. However, the lack of a central pore and the firmness might slightly favor a lipoma.

For an accurate diagnosis and treatment plan, I recommend consulting with a dermatologist in person. They can perform a physical examination and possibly recommend further diagnostic procedures if necessary. If removal or treatment is desired, a healthcare provider can discuss your options.