Cryogenic Burn

Hmmm, I was developing my radioactive film this morning. So I took the cassettes that contains the film out from the -80 degree freezer and carried them over to the dark room. On the way there, the cassettes slide a bit and lean against my upper left arm for about 2-3 seconds. I didn't think much of it since it didn't hurt and proceed to develop the film. About 10 minutes later, I noticed there is a pink bump on my arm and it sort of itches. It was then my labmate, Nathan, told me that I have a cold burn (or cryogenic burn as the professional term). I was lucky in that the first aid box we recieved from the department last weekend has burn cream. So I put a bunch on. The picture above is taken approximately 12 hours after the burn. I might go see Employee Health doctor tomorrow if there are blisters or if it hurts a lot. I need to be more careful...