Psoriasis is a common skin condition that can affect anyone, although it's more common in people between the ages of 15 and 35, according to the National Psoriasis Foundation. If you have psoriasis, your skin cells grow faster than normal.

The body naturally develops new skin cells every month to replace skin that sheds or flakes off. With psoriasis, new skin cells form within days rather than weeks. This rapid growth causes dead skin cells to accumulate on the skin’s surface, resulting in thick patches of red, dry, and itchy skin.