Something wrong with his scent gland?

[imjessiegee]

So tonight when changing my gerbil Nico's food I found some blood smeared on the edge of the bowl. My first action was to bring out the gerb to see if he had any cuts etc. he seemed fine and in no distress? I found a tiny bit of blood near his stomach/scent gland. I have taken a photo, the reason he is wrapped in my t-shirt was because he kept trying to bite me when I got my camera out. I'm in no way harming him!

www.dropbox.com/s/opopmmotmq865lk/photo%2025-03-2015%2022%2059%2033.jpg?dl=0

[vexorg]

Could be a tumour he started biting.