Tanning Bed Rash?

(I understand the risks of UV radiation and that tanning beds are bad for you, so please save the comments regarding that.) I have been going to the tanning bed for a couple of weeks to give myself some color for the winter. This was not the first time that I have gone, and I do not go all of the time. I have been slowly increasing my increments as I should be, and today I was in for 9 minutes. This rash appeared only on one elbow. What is this? Could I be allergic to the sanitizer that is used? Does anyone else have this issue?