Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Go to an emergency department for heavy bleeding that does not stop, complete inability to pass urine, fainting, or severe rapidly worsening pain and swelling.
Arrange a medical appointment promptly if you notice a penile lump, growth, ulcer, bleeding, unexplained discharge, persistent rash, colour change, or foreskin problem.
This is especially important if the area is growing or has not healed within a few weeks.
Seek urgent same-day medical care for rapidly increasing redness or swelling, fever with a penile wound, worsening discharge, or significant difficulty passing urine.
Contact your cancer team between routine appointments if you have a new change in the penis, a groin lump, worsening swelling, or treatment side effects that are not settling.
And for anyone, someone who:
Every sign above is quoted from the sofidex article on Penile cancer. If you are not sure, err upward — it is always reasonable to be checked.