I found a small lump on my 1 year old German Shepherd's scrotum. It's not on the testicle but more on the skin of the scrotum. It's a bit hard and the size of a small pea. Can this be cancer? I found it last week and thought I'd wait a week because it could be just a bite or something but it hasn't gone away. I just made a vet appointment but won't see him till next week. Now I'm getting worried.