My hamster has yellow bumps on both sides of his testicles. Why?

Thanks for reaching out about your hamster and including pictures. In the pictures the testicles appear large but symmetrical. If you feel they are continuing to swell, seem painful, discolor or other problems, a veterinary visit is recommended. For now observe appetite and activity. Good luck.

It is difficult to tell exactly from the picture you provided but I think the area you are concerned with maybe your hamsters testicles. It is normal for testicles to descend and the hair of the scrotum be thinner than the hair on the rest of the body. Depending on the age of your hamster this could be what is going on. If you would like to post another question or do a consult we may be able to help you further with what is going on. Alternatively, you could take Ant in to be examined by your veterinarian to make sure there is nothing to worry about. I hope this helps. Thanks for using Petco Pet Education Center, formerly Petcoach.

Thanks for reaching out about Tykarp and including photos (although they are out of focus and can not see the lesion). Is the yellow on the fur or from the skin? If it thick and raised? Fungal and bacterial dermatitis can cause color changes and a veterinarian should examine the skin. Try to clean the lesion with a warm wet washcloth. Good luck.

Thanks for reaching out. Could this be a bite wound from the other hamster? The dark skin is probably necrotic (dead) dermis. It could be an abscess. Infections should be treated with systemic antibiotics and possible anti-inflammatories/analgesia, as it could be painful. A veterinary visit is recommended, as only a veterinarian can prescribe antibiotics. Good luck.

I am sorry to hear about your hamster. Unfortunately we can see testicular tumors or cancer in male hamsters, so if one testicle is larger thant he other I would be concerned. If the testical is painful or turning color another possibility would be a testicular torsion, where the testical twists inside the skin cutting off the blood supply. I would recommend having a vet examine him to help determine the cause and they can recommend treatment if available. Best of luck to you!

Thanks for reaching out about Millie and including photos. Hamsters get wart-like keratin growths that are rarely painful but can get quite large. A veterinary visit can assess and provide a diagnostic/treatment plan. Good luck.

Thanks for reaching out about Odin and including photos. This does not appear to be due to being overweight, as that would likely be symmetrical. An internal mass is likely, and could involve a kidney, liver, intestines or other organ. A veterinary visit is recommended to assess and provide a diagnostic/treatment plan. Monitor appetite, urination and defecation. Good luck.