Nail is an interesting organ of the human body. It serves some important physiological and social functions. It protects the finger tips given deftness and precision in picking up small objects. Nails are of course most useful for what perhaps they were intended for i.e. scratching.

Nail Unit may show specific changes that are markers for a wide range of systemic disorders. There are no. of heritable syndromes in which the nail disease is an integral part. Nail involvement is there in more than 10% of dermatological conditions