After a trip to Vietnam, small light brown sports suddenly appear on the back of my hand between my thumb and index finger. They are never itch, scaly or painful. It has been a month since and the spots have yet to fade. Can anyone tell me what's the problem and how long does it take for the spots to go away?

Could you attach a photo ?

Did you get into a very rural area? Have activities with any of the sex workers there?

Have you went to a dermatologist yet?