shocking in its appearance this is most likely blood that drained down from your surgery site (the hernia) and had no place to run out. so it just keep seeping under the tissue until it went as far as it could go (your penis). because this free blood can be very irritating and because your penis is tender i would advise you to call the surgeon today for patient-specific advice. i do not know the type of hernia you had the extent of your surgery or anything about your medical history and blood tests so it is best to discuss this issue with a person that knows your case.
5 days ago i had hernia repair surgery today (day 5) noticed the shaft of my penis was black & blue& painful should i. be concerned?