blood blister on penis head

I have similar, if not identical symptoms.

Yes, i had similar problem caused by friction - it's almost identical - caused by having allot of sex or when you do have sex, it lasts too long and it goes dry - so you are prone to bruising/blistering you penis head. Thing is that it goes away SLOW! Ointment might help. Not sure what Mupirocin is. (an antibiotic to prevent infection - found on Wiki)
Problem is that you shouldn't wear underwear and the penis skin shouldn't cover the bruise - it will keep it moist and it needs to dry to heal. So it's a bit complicated. When you sleep you need to be careful not to put preasure on it, and most important of all when you shower - wash your penis carefully and quick around the bruise - it has a crust like any bruise that will fall off when in contact with water for too long. Don't use the towel let it dry after showering on it's own. (the crust might stick to the towel and you will take it off) Given the area where it is - it will heal very slowly if you don't keep it dry. If you sweat at night it will not help. Just one more thing - TRY not to have an erection (or have reasons to have one) when you have the crust - it will break because of the skin expansion - and it might bleed severely - and you end up with bigger crust and a deeper wound. It will take up to two weeks to heal. You shouldn't have wild sex after that - take it slowly and things will be OK!