"I'm 37. I'm not old."

(someone had to)

I get pimples whenever I switch to a new helmet. This happened recently when my old helmet broke (non accident related -- it was on my handlebars in the house, I was loading the panniers, and the bike fell down onto the helmet).

The pimples usually go away after a week or two. My skin gets used to the presence of the foreign object, since it's there twice a day every day. Maybe yours will too?