Faint black or brown streaks on nails are often harmless, but scientific evidence shows they may sometimes signal subungual ...

A silent danger could be lurking in your home—and toenails are "one of our body’s archives of past exposure," scientists say.

When Maria Delgado noticed a dark streak under her big toenail, she assumed it was from dropping her gym bag on her foot. Six months later, that seemingly innocent mark led to a diagnosis that saved ...

You’ve probably covered the basic things you can do to reduce your skin cancer risk: Wear sunscreen, avoid tanning beds, and get any suspicious moles checked out by a doctor. But no matter how ...