The skin is the largest organ of the body. It is the first line of defence against pathogens and injury. Skin diseases are common in the community. It can be primary disease of the skin or manifestation of internal disease. It can be good indicator of overall health. The common skin diseases are infections, eczema, pigmentation, acne , contact dermatitis etc. One should not treat skin diseases by themselves as it can cause irreparable damage to the skin. Dermatology is the science that deals with diagnosis and treatment of diseases of the skin, hair and nails. Therefore, one should consult a dermatologist if one suffers from skin problem.