Your skin is the largest and most visible organ of the body and has many functions. It controls body temperature, protects against injury, and prevents infection. Your skin reflects your health. Dermatology is a field of medicine which deals with the science of skin, its, structure, its function, and its diseases. Since skin is more complex than a simple wrapping, it is subject to disease. Sooner or later, everyone has some kind of skin problems. This is when dermatologists, doctors who specialize in skin care, can help you.