There was a game/challenge that went round at my high school when I was about 12 years old. You had to have someone hold an inhaler to your skin and pump it as many times without pulling away, it froze your skin and eventually left a big blister.
I feel really embarrassed that I ever participated but I was 12 and some older kids were doing it so obviously that makes it a brilliant idea.
A couple of times a year my arm gets tender where it happened and it makes me worried. I feel a bit embarrassed to go to the GP about it but I'm starting to think it might be a good idea to go.
Does anyone have any idea what causes the tenderness? Could it be to do with the scar tissue?