blister

I’ve been vac hanging and vac ads most of the day for a couple of months now, my skin on my glans really dried out and I had a blister, the blister popped by its self and I have a small scab which you can see in the image below. I’ve taken a week off and the blister/scab is almost healed, “but...

First day two blisters next to uretha(mad a mistake and popped them). Second day two blisters next to My uretha. What I am doing wrong?