I have what appears to be a wart/unusual lump on the head of my penis that doesn't seem to be going away. it is painless (mostly) and cauliflower like. what should i do? and is it common amongst men?

See dermatologist: sounds like a wart, that we call condyloma accuminata. would see dermatologist for dx and tx.

Genital wart: A cauliflower like growth at this location is usually caused by a strain of genital human papiloma virus (HPV). These are spread by direct sexual contact. You are likely passing the virus to any sexual contact. A dermatologist, urologist or your GP may have the equipment to freeze it or provide meds to remove it.