Hello Doctor,

Since a few weeks, I've developed black patches on the knuckles of my middle fingers on both my hands. The surface of these black patches are somewhat rough compared to other parts of skin of my hand. Now, it looks like the black patch is appearing on the knuckles of my thumbs also. Can you please advise ? I'm 32 years old with good health and no history of any skin ailments.

Thanks,

Hanumanth Reddy