Cysts are usually noncancerous and have a sac-like structure that can contain fluid, pus, or gas. Cysts are common and can occur anywhere on the body. Cysts are often caused by infection, clogging of sebaceous glands, or around earrings.
If it becomes swollen or tender, home treatments may help. Putting a warm moist compress over the cyst may help it drain, for instance. Resist any temptation to pop or squeeze the cyst, like a pimple. But if it’s inflamed and causing discomfort, you should see a doctor.
Some cysts are cancerous and early treatment is vital. If left untreated, benign cysts can cause serious complications including: Infection – the cyst fills with bacteria and pus, and becomes an abscess. If the abscess bursts inside the body, there is a risk of blood poisoning (septicaemia).