Let's talk about a painful subject here for a moment... No one likes to talk about them, however, they do happen: Head Blisters.
Head Blisters are caused when a small break occurs between the outer dermis and the inner dermis of the gland on the head or neck of your cock under negative pressure (or suction).
This most often occurs after over 30 minutes of extreme negative pressure above 7psi.
Recommendation: stay at or below 5psi, and you should be ok. (Staying at 5, even though a slow process, allows your dick to actually become acustom to stretching at it's own pace. and you can keep modifying your psi because as your cock grows in the cylinder, it takes up space and lowers the psi. So, yes, monitor, and when it dips below 5psi, give your pump a squeeze, and keep it at 5psi.
However... You will want to depressurize every 20 / 25 minutes, to allow new blood to circulate thru your cock. Its a living thing, it needs it...
Ok, blisters - what to do.
People see a blister, and right away, they wanna pop it. Let me tell you, that's the worst thing you could do. If its bad, seek medical attention. (Bigger than a pencil eraser.). First thing to do is STOP PUMPING and RELEASE the Negative pressure. And for Pete's sake (get it "pete" lol) don't start pumping again.
Ok... Don't pop it. (But you did anyway). Let me tell you, your gonna me miserable for about 5 days; and only 5 days if you do what I recommend.
First clean your whole cock including the wound very well with anti - bacterial soap (not shower, or deoderant soap - use that Dial anti-bacterial, or that soft and soap, or anything anti-bacterial). I like that soft soap you get at walmart (or even it's equate generic).
Clean your whole dick with it very well. DON'T pull the excess blister skin off! Your body will use what it needs and let the rest go on its own.
Now, let me warn you - Water is going to hurt! This is a good thing. Its a reminder that your dick is still alive and to never take it to that extreme again. Wash - Rinse - BLOT DRY. (Twice, 3 times a day if you can).
Apply a drop (not a glob, just a drop) of Neosporin or that Eucerin stuff to encourage a quick heal every time you clean it.
I keep a piece of non-stick gauze cause over the blister held there by the overlapping foreskin. However, every time you pee, your gonna have to change it out to prevent infection. The non-stick gauze is because the blister is going to drain on it's own. And if you allow it to just leak every where, your junk is going to stink, and it's going to get infected. The gauze will actually pull the fluid away from the wound thus allowing it to heal more efficiently.
This will heal in about 5 days, however, you will not want to resume pumping until after 8 days.
If you didn't pop the blister, good for you! You are a strong person! just follow the same steps above including the gauze and neosporin, and the blister will pop, drain, or diminish on its own; and will heal in just under 4 days, and you can begin pumping after the 4th day again.
Hope this helps.
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