What causes lip lines?

Lip lines or wrinkles around the mouth are complicated, because they show up over time; sun exposure and smoking are big culprits. Watch dermatologist Doris Day, MD, discuss some causes of lip lines, and share tricks for treating them.

Wrinkles are creases in the skin—most of which are the result of aging—and, unfortunately, there's little you can do to prevent them.

Necrotizing fasciitis is a dangerous infection that can start suddenly and move fast. Spot the signs and know how to respond.

These six possible causes of hair loss may surprise you.

Necrotizing fasciitis is a dangerous infection that can start suddenly and move fast. Spot the signs and know how to respond.

Find out what happens if you neglect to wash your face.