The most common finding is a painless sore on the foreskin or glans that won't heal. If the man cannot retract the foreskin the cancer may not be discovered until it grows large and appears as a cauliflower-like mass growing from beneath the pouch of the foreskin. If left alone, it will usually become inflamed and often infected. This may produce a foul odor and discomfort. It can also lead to enlargement of inguinal lymph nodes . Penile cancer rarely interferes with urination.