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

Another woman was diagnosed with melanoma after noticing black lines under her thumb nail during a manicure. In the comments, many people urged her to seek help after seeing the black lines, telling ...

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 ...

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

When David Edges's wife spotted a faint brown line on his toenail, he didn't think it was anything to worry about. But Kelly, 47, a skin specialist in the beauty industry, was instantly concerned, ...

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 ...