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A cyst can appear as a bump on your skin. It may also feel like a small lump if it’s growing just under your skin.
Some cysts grow deep inside your body where you can’t feel them. However, they may cause or be related to other symptoms. For example, ovarian cysts, such as those that result from polycystic ovary syndrome (PCOS), may cause problems with ovarian and reproductive function. Polycystic kidney disease (PKD), which causes cysts to form in the kidney, can adversely affect kidney function.
Cysts usually grow slowly and have a smooth surface. They can be tiny or very large. Most cysts aren’t painful. They usually don’t cause problems unless they’re:

•     infected
•     very large
•     impinging on a nerve or blood vessel
•     growing in a sensitive area
•     affecting the function of an organ

When to see your doctor

Schedule an appointment with your doctor if your cyst becomes very painful or red. This could be a sign of a rupture or an infection.
A doctor should check your cyst even if it isn’t causing any pain or other problems. Abnormal growths can be a sign of cancer. Your doctor may want to remove a tissue sample for testing.