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Burns are classified as first-, second-, or third-degree, depending on how deeply and severely they penetrate the skin's surface.

Acne is a disorder of the hair follicles and sebaceous glands. Hair follicles are the areas around the base or root of each hair. Sebaceous glands are the tiny glands that release oil (sebum) into the hair follicles. The sebum moistens the skin and hair. The sebum and hair get to the skin surface through tiny holes called pores.

In an uncircumcised boy, the foreskin will begin to separate from the tip of the penis. This happens naturally while the boy is a baby. This is called foreskin retraction.

The only safe sex is no sex, most doctors say. But certain precautions and safe behaviors can reduce a person's risk of contracting a sexually transmitted infection.

Juvenile idiopathic arthritis (JIA) is a form of arthritis in children. Arthritis causes joint swelling (inflammation) and joint stiffness. JIA is arthritis that affects 1 or more joints for at least 6 weeks in a child age 16 or younger.

Details about when to call your child's health care provider after a burn.

A detailed look at the way children may feel about having congenital heart disease, plus some tips for helping them cope.

Children with congenital heart disease often grow and develop more slowly than other children. Here's what you should know.

Detailed information on blisters, including causes, first aid, and treatment.