Vitiligo is a condition that causes loss of skin color (melanin). Some people develop only a few spots that are discolored and become white. Others have more extensive melanin loss. Vitiligo can develop in any part of the body. Sometimes it can also affect the hair. Skin color can return on its own, however, most often the loss of melanin can be permanent if left untreated. A dermatologist can help mediate this skin condition with various treatments.