Vin,
Since radiation my mom has had numerous squamous cell cancers turn up on her body...legs, arms and even her scalp. She has surgeries to remove them or they freeze them off with dry ice. Her dermatolgist says they are not related to her oral cancer but that they are from sun damage and the radiation exposure made them come out faster. She says they would have come out eventually but the radiation brough them out. They are slow growing and slow spreading and she hasn't had any severe problems with them. Just thought I would share.
Take Care,