Why is my hamster's red, scabby rear spreading and losing hair?

That area could be inflamed because of diarrhoea for example or because of a skin infection (commonly bacterial infection or due to mites infestation). A clinical examination at your local veterinarian is essential to confirm these clinical suspicions and treat appropriately.

Thank you for using Petco Pet Education Center, formerly Petcoach! It is a little difficult to see in the photo, but there is what appears to be a small area of scabbing and hairloss, both of which are patchy on the hip. This can be caused by a skin infection, certain cancers, fungal infections, or skin mites which are very common in hamsters. These mites live within the hair follicles rather than cage surfaces, so cleaning the cage will not get rid of any of the possible causes. Mochi should be seen by a vet who can perform some quick tests on this area of skin to determine the underlying cause and start her on the appropriate treatment. In the meantime, to keep her more comfortable, you can gently trim her nails to keep her from traumatizing herself as she scratches. I hope this helps!

It could possibly be mange (mites in the hair follicles), ringworm (a fungal infection), or a bacterial skin infection. As ringworm is contagious to people and can spread rapidly, I recommend bringing your hamster to a vet for an examination and diagnostics based on the appearance of the lesions. In the meantime I would recommend handling your hamster with gloves and bathing with an antibacterial/antifungal shampoo such as Malaseb shampoo if you have access to this without a prescription where you live.

This presentation could be due to a trauma, a mass or a localized spot of skin infection (likely to be caused by bacteria or mites). A check up, appropriate disinfection and possibly antibiotics (oral, topical) are needed to solve the problem. Disinfection may be started at home with very diluted hibiscrub or betadine or salted water baths. Hope this answer was helpful, but please do not hesitate to contact us again on the forum or by requesting a consultation if you have any more questions or to discuss it any further.

This presentation could be due to a trauma or localized spot of skin infection (likely to be caused by bacteria). A check up, appropriate disinfection and possibly antibiotics (oral, topical or in a shampoo formulation) are needed to solve the problem. Disinfection may be started at home with very diluted hibiscrub or betadine or salted water baths.

Thanks for reaching out about Biddy. Is Biddy new? Could it have been a fight with another animal? Hair loss, swollen and scabbed sounds like a wound. This could be parasitic, bacterial, fungal, endocrine and more. A veterinary visit is recommended to assess and provide a diagnostic/treatment plan. Do not apply anything topical such as Neosporin as some of these medications can be ingested and cause problems. Good luck.

Thank you for using Petco Pet Education Center, formerly Petcoach! It sounds like Bear may have a fungal infection, fur or skin mites, or a skin infection. Most of these conditions are very itchy, and some hamsters may actually scratch so much that they draw blood. This can lead to further infection as the skin barrier is compromised. I recommend having Bear looked at by a vet as soon as possible to determine the cause of his skin condition and begin the appropriate treatment. You can carefully trim Bear's nails in the meantime to prevent him from causing further trauma. I hope this helps!