Avoid excess stress on your penis, and give it time to thoroughly heal.
Watch like a hawk for the blisters to start to resurface, and stop immediately. Take more time off after that before you resume PE.
Draining the liquid won’t do any good.
If Desitin is safe enough to use on a regular basis for diaper rash, I suspect it is safe enough to use on your penis daily.
https://www.desitin.com/