Milia, also called milk spots, are small, pearly white cysts that form under the skin. They develop when keratin—a protein that makes up hair, skin, and nails—gets trapped beneath the surface. About ...

On the long list of skin things that look like acne but actually aren't: fungal acne (it's actually folliculitis), butt acne (also, probably, folliculitis), and, of course, milia. To the untrained eye ...