large lump on lower abdomin

Question
our pet rat has a large lump on her lower abdomen. she is not with any other rats and the lump appeared about 2 weeks ago.it was small but seems to be getting larger.do you have any idea what it may be or what caused it?

Answer
Yes, this is a mammary tumor and needs removed.  Its NOT cancer but can be a problem for her health.  Please put her back with her friends. She is not contagious in any way.

Also please educate yourself on rat care and on mammary tumors and read up on them.  Go to my site, sandyscrittercity.com and look over the photos and read up  on the lumps under the topic
TUMORS.

Let me know when your done and we need to find a vet for her to get them off.  How old is she?