[Amethyst_ice]

Hmmm the poster is in Brazil...im afraid without a picture we couldnt begin to try identify. Sounds like a mite...or could be where you place your cage and they have just got on the hammies?

ive read chickens can get red mites but i think they would be quite large on a dwraf hammy.

I would suggest cleaning the cage completely and moving it to quarentine, keep us posted x