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A needlestick injury means the skin is accidentally punctured by a used needle. Diseases that could be transmitted by a needle or needlestick injury include human immunodeficiency virus (HIV), hepatitis B and hepatitis C.

A blister is one of the body's responses to injury or friction.

The body begins repairing a wound immediately and the process may continue for days, weeks, months or even years.

Chronic wounds are more likely to heal if they are treated with moist rather than dry dressings.