Medically reviewed by Susan Bard, MD Boils are painful, pus-filled, and are caused by infections like Staphylococcus aureus.Cysts are painless, non-infectious growths filled with keratin or other ...

Hair grows out of pores, small openings in the skin that secrete sweat and sebum (oil). An ingrown hair cyst occurs when dirt or oil blocks off a pore, causing a hair to become trapped. This leads to ...

A 27-year-old man will have a scar on his face for the rest of his life, after what he thought was a pimple turned out to be an infected cyst. In late 2024, Kai Davidson noticed a small lump on the ...