A skin cyst is a lump under the skin caused by a build-up of fluid.
A skin cyst looks like a round lump just under the skin. They can range in size from smaller than a pea to a few centimetres wide.
Most cysts can be left alone. You can use a warm flannel to help it shrink. If the cyst is infected, you may need antibiotics.
Page last reviewed: 18/05/2017
Next review due: 18/05/2020