WHAT ARE BLOCKED HAIR FOLLICLES?
Blocked hair follicles are small, painful bumps that form under your skin. They can be a sign of a skin condition called hidradenitis suppurativa (HS). You’re most likely to get them in places where you sweat a lot, such as your:
Blocked hair follicles start out like pimples. If they get worse, they can grow deep into the skin and look more like cysts or boils. They may also burst and leak pus or blood. They can make tunnels under your skin.
Once they start to heal, you can get thick scars. Those scars can make moving difficult in places like your underarm or groin.