My husband had chemotherapy to erradicate his cancer, and just after he completed his rounds, he developed "zit" like bumps on his fingertips that were extremely sensitive. He has now developed one on his butt cheek that he has had for over a year now. He says that it hurts so bad, he can feel it when he sits down. He is also able to squeeze it like and zit, and he does manage to relieve this "pressure". What can I do to help? Is this common? Dani