How old is your pupper?
If he/she is under 12-16 months it is most likely canine papiloma virus. Xerxes had them all over his cheeks and a few external ones. They didn't seem to bother him, but they did bother me.
Do not let him share water bowls, toys or other chewies with other dogs. The papillae are contagious, but usually with young or very old dogs.
They should go away in about 12-16 weeks. If they don't, or if they get worse, consult with your vet, or a veterinary dermatologist.
In the minds and hearts of Pharaoh Hounds-serious moments can be dissolved by a good frolicking run with stolen goods.