Veterinary questions? Ask a Vet for Answers ASAP
You're through to Dr. Edele, a UK vet.
When did you first notice this lump?
Has it grown much since you first saw it?
Thank you for the information.
From looking at it and what you've said coupled with her being close to middle-age there is a concern that this may be something sinister. It could also be an abscess from a cut that would be treatable (open and drain and antibiotics) but without having a good feel of it I can't be sure. Both of those would grow quite rapidly and don't always make a hamster seem sick.
As there's that little bit of blood today, it may be that it's something trying to burst out. My advice would be to have a full examination at your vets to find out what the lump is (rule out abscess/treatable mass).
If it is something cancerous, surgery is not something you have to do, palliative care is completely fine (and in many cases preferable).
You're welcome. If you have any other concerns/queries afterward you can still return here (even after accepting/rating) and I'll do my best to help.