A skin sore called a chancre is the first symptom of sexually transmitted syphilis.

Nearly all of these species contain a venom in their skin called bufotoxin which is a naturally a mild hallucinogen.

Acne occurs when tiny holes on the surface of the skin, called pores, become clogged.

It's the flakes from the animal's skin, called dander, not the fur.

Psoriasis causes areas of dry, red, flaky skin called psoriatic plaques.

Sometimes this allergic reaction also triggers an itchy rash on your skin, called hives.

Part of this protection is an oil produced by your skin called sebum.

Whales have a thick layer of fat under their skin called blubber.

That's because over time, the sun's ultraviolet light damages the fibers in the skin called elastin.

Antlers grow as highly vascular spongy tissue covered in a skin called velvet.