Vitiligo is a common disease leading to white patches on the body. This is generally due to an autoimmune process, i.e. the melanocytes (colour forming cells of the skin) are damaged due to their conflict with our own immune system.
That way vitiligo does not pose any problem with one’s health as such. It is only a cosmetic problem. But unfortunately there is a deep seated fear and associated stigma in Indian society about this disease. These patches create problems in matrimonial searches. So even if there is a small patch on the body, patients are alarmed and will not be satisfied unless it is fully pigmented.