Cysts are small sacs filled with dead matter, and form on the surface of the skin. They can be filled with a fluid, hair, other material, or even air. Many a times, hair removal causes some follicles to get stuck in the skin, leading to bumpy cysts. There can also be other causes like an infection, or a blockage in the ducts. Like any other skin outgrowth, it is important to get a cyst diagnosed.
Some cysts might get healed on their own in some time, while others will need clinical removal. The most common method is surgical excision. In the procedure, the dermatologist will first numb the area around the cyst. S/he might drain the content of the cyst before removal. Once it is done, the extra growth is carefully removed using surgery. In case the cyst is small, the dermatologist might not even go for a surgery, and just drain the dead matter and fluid out, and leave it to heal.