I Slipped In My Shower A Few Weeks Ago Hitting

I slipped in my shower a few weeks ago hitting the track of the shower door causing a bruise to my shin bone on my left leg. I'm 58 years old with type 2 dibetes. Shin swelled up as it did before when I did this in another way (shin bone bruise) and now swelling has subsided a good deal. I now have these little itchy bumps developing on the top of my skin. I have almost an entire tube left over of some ointment/salve called Mupirocin ointment USP, 2% and was trying to think if that's what I was using the last time this happened. Whatever the doctor prescribed for me worked very well and I think this is it.