Hi , I'm James DVM MRCVS and would like to help you with your question
could you please tell me where is this lump located ?
does it have healthy skin above the mass or does it seem wounded
Thank you for you answer . this could be one of several things which are worth considering .
1. it could be something that has perforated the skin and settled under it - creating the lump (such as small piece of grass or bedding)
2. could be an abscess which has developed due to an injury or a scratch (specially if you have more then one living together)
3. could be a benign mass - non cancerous tumor which has developed
4. could be a cancerous tumor thou less likely
What needs to be done is to sample is using a needle - this can be done at any vets .
I am sure it would turn out as nothing but I advise to visit your vet to have the lump tested .
I hope this has helped you .
if you have any further questions - please leg me know .
All the best to you both .
Hi .. Just wanted to ask how your hamster is doing ?