Dermatology is a branch of medicine specialising in managing diseases affecting the skin, mucous membranes, hair and nails. Skin is the integument of man and most animals and forms their outermost layer. It is the largest organ of the human body and may have numerous potential abnormalities. Since it is so superficial, any changes in it could be very obvious. Meaningful interpretation of skin signs including distribution, configuration, morphology, colour, surface and secondary changes enables one to make an accurate diagnosis.