Name the DRDO scientist who has developed a herbal drug to treat leucoderma.

Hemant Pandey, a senior DRDO scientist, has developed a herbal drug - Lukoskin - to treat leucoderma, a condition in which white patches develop on the skin. The auto-immune condition, also called 'vitiligo', can be life-altering. Vitiligo is neither contagious nor life-threatening. Worldwide, the incidence of leucoderma is 1-2% of the population. In India, its incidence is around 4-5% in some parts of Rajasthan. In Gujarat, it is very high at more than 5-8%. This skin disorder is considered a social stigma in India where people confuse it with leprosy.