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Whenever the normal drainage pattern in the lymph nodes is disturbed or damaged - often during surgery to remove the lymph nodes - the arm may swell. This swelling, caused by too much fluid, is called lymphedema.

A seborrheic keratosis is a growth on the skin. The growth is not cancer (benign). Its color can range from white, tan, brown, or black. Seborrheic keratoses often appear on a person’s chest, arms, back, or other areas. They’re very common in people older than age 50, but younger adults can get them as well.

A mild concussion is caused by a blow or jolt to the head.

This test measures the amount of the medicine phenobarbital in your blood. Phenobarbital is used to treat epilepsy.

This test checks the level of the seizure medicine phenytoin (Dilantin) in your blood.

Ringworm is a type of skin infection cause by a fungus. Learn more about this condition, including cause, symptoms, diagnosis, and treatment.

Epilepsy is a disorder of the nervous system. It is also called a seizure disorder. Normally the body's nerves send information by electrical and chemical signals. People with epilepsy have abnormal electrical signals in the brain. This can cause a seizure.

A head injury can be as mild as a bump, bruise (contusion), or cut on the head. Or it can be a concussion, a deep cut or open wound, broken skull bones, internal bleeding, or damage to the brain. Head injuries are one of the most common causes of disability and death in children.

Strokes are classified as either ischemic or hemorrhagic. Read on to learn more about the different types of stroke.