18 Celebrities That Were Secretly Battling Illnesses

2. Jon Hamm

The lead star of the hit series “Mad Men” has a rare skin condition known as Vitiligo. The said disease affects less than one percent of the world’s population and causes parts of the skin to look splotchy. Essentially, Vitiligo kills some of the skin pigmentation cells in the body. As of today, there is still no known cure for the disease. Fortunately though, it isn’t a life threatening illness.