If you see signs that your Guinea Pig could be ill then seek advice from others. However due to the fact they can hide illness well and by the time you notice the signs it could be too late.. Seek advice from a VET immediatley
I KNOW!! MINE IS TOO!! Is he/she a long haired? Give he/she a sponge bath. Put a little soap on a rag and scrub around DONT RINSE!! It will dry. I think im going to the vet!