I would get those checked by a doctor. I wouldn't assume cancer ther are lots of other far less serios things it could be (cysts are very common). Tell your dad your not sleeping well because of the worry, you certainly don't need to the anxiety of cancer keeping you awake when a simple doctors visit will let you sleep at night.
Son Jason diagnosed 4/30/04, stage III. Right I/O 4/30/04. Graduated College 5/13/04. 4XEP 6/7/04 - 8/13/04. Full open RPLND 10/13/04. All Clear since.
Treated by Dr. Rakowski of Midland Park, NJ. Visited Sloan Kettering for protocol advice. RPLND done at Sloan Kettering.