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Mice/Mousey genital swelling



i have a mouse not even a year old...i believe he was the runt of his litter as he is very small. Yesterday as i was changing his food and water i noticed that the area where his genitals are (below his tail, NOT his anus)is swollen and pink...i have done some research online but still have not come to any kind of real far as i can tell it may be an abscess, though i did come across an article about semen blockage and how this area may become swollen due to it. i guess i would just like some guidance as i don't have a mouse vet readily available to me...He seems to be carrying on as usual, i.e. he is still eating, moving about his cage, and cleaning himself as normal. he does not seem lethargic, his poop is normal though i did notice that his pee is more yellow then usual...Please help me find some kind of answer so i know where to go from here...i am unsure how to help him at this point and i don't want to see him get really sick and suffer :(

Dear Sophia,

This is a pretty complicated situation and I have no medical training. My expertise is in behavior. When you say you don't have a mouse vet readily available-- does that mean you have one available but it is inconvenient or difficult? This mouse needs a vet. Mice are seen by "exotics" and "pocket pets" vets.

Try one of these two resources to find a good vet:

If you absolutely cannot get this poor mouse to the vet, write back and I will talk to some people I know who are pretty well-versed in rat health, which in most cases is exactly the same. But this option is not anywhere nearly as good as going to a vet, and we don't know if the mouse has something going on that could be fatal if untreated; or untreatable without a vet.

If you do write back, please send photos so we are much more likely to have insight.

Best of luck.




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I can answer questions about raising mice and caring for them as pets, with knowledge from my 38 years of having fancy mice as pets. I have NO MEDICAL TRAINING and you should take a sick mouse to the vet; but if you simply can't, I will try to help you. I LOVE PHOTOS!!! I ALSO LOVE UPDATES! Let me know how the little tyke is doing later on, for better or worse, especially orphans. It also helps me to help the next person. Please first search first: use 'Natasha Mice Mouse' with whatever else your question includes. Or check out these links: **** YOUR FIRST MOUSE (my video; rough draft): **** TEN VIDEOS ON RAISING ORPHANS: **** SEXING MICE: **** And some GREAT MOUSE INFO SITES:


I have had mice for 40 years (since I was 5!). I raised them when I was a child but now I keep all females, and never fewer than three so that if one dies the others are not devastated, because they have each other.

I run Rats and Mice are Awesome on Facebook. The official name is Rats are Awesome.

B.A., M.A., M.A. in Linguistics: Yale University and University of Connecticut

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