Dermatology is the branch of medicine concerned with the diagnosis and treatment of diseases of the skin, hair and nails.
The skin is the largest and most visible organ of the body. It reflects the health of the body and acts as a barrier against injury and bacteria. Unfortunately, at one time or another, nearly everyone has some type of skin disease - infants, children, teenagers, adults and the elderly.
A doctor who practices dermatology is called a dermatologist.