What happened to my skin? I went out for a tan then had these tiny bumps on my stomach?

I was tanning outside for 30 mins in my bkyard, it was almost 100 degrees outside but I kept cool with a fan and a body mist. When I came inside I noticed tiny white bumps all over stomach, chest, they sort of looked like speckles of sand but that's impossible. I looked closer and they looked like tiny white hads. They didn't itch. This never happened before either. They disappeared like after 10 mins. What was that? At the time It got me scared to never want to tan again.