Hammy spot REALLY NEED HELP!!

Ok, I must seem like a really bad owner as my brothers guinea pig is like depressed and now this. I went on holiday and a friend looked aftre my hamster. Anyway, when i came back i collected Timmy and i noticed on his on his back right foot a little sore was appearing. Well it wasnt a sore a such but the skin there was a little darker than usual, afterwards i monitored it for a few days and then it started to develop into a lump and now it is sort or blackie red. I will post pictures. Can anyone tell me what is?
Thanks xxx

Hmmm, sounds like bumblefoot to me. Although I don't know very much about it, I know it's an infection on the foot that is red and sore and is caused by living on wire floors or having to constantly walk on a dirty environment, like a very unclean cage. Hope your hammy gets better! Sorry I can't help much, but maybe there are some people on here that can give you more info.

~abigail

thanks that is a LOT of help. I am going to post pictures shortly. thank you

There is no need to worry anymore because we went to the vets and she said it was a blood blister! Eww. She said it may pop but there is nothing to worry about! :)