Keratinous Cyst

A keratinous cyst, also known as an epidermal or keratin cyst, is a small benign sac that forms beneath the skin and fills with keratin, the protein that skin cells produce. It usually grows slowly and is not cancerous.

How it presents: a rounded, soft or firm lump beneath the skin, sometimes with a small central point; it may become inflamed, reddened, or bothersome if it becomes infected.

When should it be checked? If the cyst grows, hurts, becomes red, or causes discomfort because of its size or location.

Which specialist evaluates it? The dermatologist and the general surgeon can examine the keratinous cyst and provide guidance on the options depending on the case. Avoid squeezing or handling the lesion; when in doubt or with signs of inflammation, a professional evaluation is the best option.