Dermatology is one of the branches of medical sciences related to physiology and pathology of the skin, hair and nails. The field involves the diagnosis and treatment of conditions and diseases of the skin and appendages. .The skin is part of the integumentary system which is the largest organ system of the human body. Accessory structures of the skin are the hair and nails, sweat glands and oil glands. The skin and accessories are prone to various acute and chronic problems from acne, rashes, warts, hair and nail problems to skin cancer, psoriasis, eczema, vitiligo and so on.