What happens when a cyst becomes infected?
Both epidermoid and pilar cysts are normally small, semi-spherical lumps that appear just under the skin. They are not painful and do not produce fluid or pus.
If the cyst becomes infected, the skin around it becomes red and the cyst may feel sore or itchy. The cyst may burst, releasing yellowish pus, which can smell unpleasant.
If this then resolves the problem and the cyst heals quickly, it may not need further treatment. However, if a cyst is infected and does not heal, or repeated infections occur, cyst removal is the best option.
Before you have this procedure, you may need antibiotics to clear up the infection first.