Really itchy after tanning?!

So I went tanning a couple times this month to get some color for a dance I had last night and usually I shower after I'm done. But I went this Friday and I put tanning lotion on like I always do and I bought it at the tanning place, but I put it like an hour before I went and went tanning and went to my friends house. I noticed that I started to get really really itchy and Iwas changing clothes and saw that my stomach was really red like I was burnt and I had this small little bumps on my midsection. I took and allergy pill and showered in the morning and even several days later I'm still really itchy and there are still some bumps on me and I keep having to scratch and it's like my breasts and top half of my stomach that are irritated the most. What's going on?