There is often an enlarged skin pore above them. They can develop anywhere on the body, but are most common on the head, back and neck. They are usually hard and move easily under the skin. They contain a cheesy, foul-smelling substance made up of skin secretions. Epidermal cysts are not painful unless they burst under the skin and become inflamed or infected.
In case of recurrent inflammation or in places that are aesthetically or functionally troublesome, they can be removed without any problems.