So sarcoma is a type of cancer. I'm not sure that's what you meant?
Did you mean you felt a lot of bumps? These could be caused by a lot of things - HPV is one, but it could be hemorrhoids, a fungal infection, normal skin variations.
You wouldn't transmit it via your hands if it was HPV, but you could via protected anal sex, as HPV is transmitted by direct skin-to-skin contact (genital to genital skin, or genital to anal skin), and the condom doesn't cover all the skin.
Don't freak out though - you don't know that it was HPV.
And we have oral sex each other, is there any risk for hpv?