Help!! Baby’s penis “balloons” while peeing

Me

My son is almost 7 months old and the last two days he’s been screaming and crying in pain while urinating. I’ve noticed his entire penis swells and he can’t keep a constant stream going, but is still able to pee. Not as much as usual, but still making enough wet diapers. He isn’t circumcised so I’m thinking infection? No other symptoms besides the ballooning and pain. No fever! His doctor wasn’t able to see him the day it started but prescribed him some antibacterial cream to see if it helps. Has any other mom gone through this or heard of this? What was the diagnosis and outcome?? Responses greatly appreciated!!