Sores/blister on head after use?

Anyone get blister after use?…used lube, 1 hour, but did twist side to side slightly to help pull out “dents”
Blisters happen when you have a fold in your sleeve. Or you have undo pressure on your head. the best thing to do is to make sure all the blood is out of your head. That way, these things won't happen.
 
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