Dermatology is the branch of medicine focuses on the diagnosis and treatment of conditions related to skin, hair and nails. It is a specialty with each medical and surgical aspects. It also concentrates on maintaining the health of the skin. Skin is the body's largest organ, which covers and protects the body. Anything that irritates clogs or inflames the skin can cause symptoms such as redness, swelling, burning and itching. Common skin conditions include warts, ringworm, impetigo, Vitiligo, Psoriasis and skin tags.