Cysts are small sacs filled with fluid, air or skin cells that can pop up just about anywhere.

Also known as a pilonidal cyst, the condition forms when a sac of tissue fills with air or fluid in the crease of your buttocks. Pilonidal cyst, doctors say, is mostly caused by a skin infection.

From time to time, we all experience lumps and bumps around our genitals. That’s just a given. And because it’s so common, it’s hard to know when it’s time for a trip to the doctors and when ...