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Herpes simplex virus type 1 (HSV-1) can cause groups of small blisters that usually appear on the lip and around or inside the

Herpes simplex virus type 2 (HSV-2) can cause groups of small blisters or sores that usually occur on or around the genitals or

The spine is formed by 33 interlocking bones called vertebrae. Located between each pair of vertebrae is a disc. The disc is

The bones (vertebrae) that form the spine (backbone) are cushioned by small, round, flat discs. When these discs are damaged from

A stress fracture is a hairline crack in a bone. In some cases, the crack may be so small that it is not visible on an X-ray. A

The skin is made up of three layers: the epidermis, the dermis, and the subcutaneous layer. The skin contains sweat glands, nerves

Bruises (contusions) occur when small blood vessels under the skin tear or rupture, most often from a twist, bump, or fall. Blood

Frostbite is more likely to affect the ring finger, pinky finger, tips of the fingers, and outside of the hand, which are harder

Pinkeye (conjunctivitis) is redness and swelling of the conjunctiva, the mucous membrane that lines the eyelid and eye surface.

If the eyelid has a cut that is more than a scratch (laceration), the eyeball may be damaged. Something may be puncturing the