MY HAMSTERS HAS LARGE LUMP ON THEIR REARENDS

Question
THE LUMPS ON MY HAMSTERS HAVE LUMPS ON THE REARS I HAD 4 IM DOWN TO 2 NOW SINCE THE LUMPS SHOWED UP 3MONTHS AGO. WHAT COULD CAUSE THIS TO HAPPEN?

Answer
heya,
you don't give much info...but i am assuming what you are seeing are the male hamsters testicals.
  when the weather is warm the testicals hang low, and when the weather is cloder they shrink back up inside.
 so there is nothing wrong with your hamsters, as far as i can tell from your description, its perfectly normal.
~suzi