Minor medical

Question
My son just got this pig from a friend.  I believe the she is a female and about a year old.  I was petting her tonight and I noticed a "knot" on one side.  Do guinea pigs get cancer like rats?  What is the average life of a pig?  Hope you can help me and thank you for your time.  

Answer
Shalom --

Well, there are several causes for this and yes, one of them is cancer.  Guinea pigs can get almost any disease humans can, so I would expect almost anything.  To be perfectly honest, I would take this animal to the vet.  Most of the things that cause lumps are pretty serious.

I know this isn't the news you wanted.  If you have any more questions, please feel free to contact me -- I'll try to provide better news.  Good luck!

Lorena