A blackhead is also called an open comedo (single for comedone), and it is a clogged pore in the skin that is open to the air. Keratin (skin protein) and sebum (oil) combine to block the pore….
A scalp with a couple of pilar cyst has joined the pop party! A pilar cyst, also known as a trichilemmal or isthmus-catagen cyst, is a benign (non-life-threatening) …