Medically reviewed by Katlein Franca, MD Key Takeaways A wart is a hard bump caused by a virus and can be removed with over-the-counter products.  A skin tag is a soft flap of skin usually found in ...

Hidradenitis suppurativa (HS) is an inflammatory skin condition that can cause painful lumps underneath the skin. Plastic surgery, such as skin grafts and skin flaps, may help treat the condition.