London, February 7: Pop star Michael Jackson's fans have been worrying about his health ever since the `Thriller' star was seen with a raw and painful-looking skin condition.

Jacko was seen coming out of a Beverly Hills clinic this week.

According to the Daily Express, the singer appeared with cracked, swollen hands and blotchy cheeks, before stepping into his car still wearing a surgical cap and mask.

He is believed to be undergoing treatment for Vitiligo, a disease which causes loss of pigment and irregular, patchy skin.

Pictures showing Jackson raising his trousers to reveal dark, raw patches of skin were posted on the Internet by his fans last week.

He has been rumoured to be a user of skin lightening creams for years.

He told talk show queen Oprah Winfrey about his rare condition more than a decade ago. (ANI)