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.

Even better than treating psoriasis is preventing a flare-up in the first place. Here’s how.

Here’s how to use everyday cleaners safely and correctly to ward off germs.

Get the dirt on what causes allergies and asthma.

While some bites and stings are harmless, others could send you to the emergency room.