Pop star Michael Jackson might be just three months away from his much awaited O2 concert series in London, but the reclusive singer is yet not ready to show his face in public.

The 'Thriller' singer decided to wear a surgical mask to cover his face, while out shopping in Beverly Hills in Los Angeles, reported ‘Daily Mirror’ online.

The 50-year-old star who had made a rare public appearance in London's O2 Arena to announce his 50-date concert series in February, has been dogged by rumours surrounding his health that put a question mark on his ability to perform the fluid dance routines that he is famous for.

And his latest appearance has not helped quell the rumours.

The "Smooth Criminal' star had reportedly consulted a doctor to help him bulk up for the series which will begin in the month of July.