I think I had An allergic reaction…

I noticed my chest broke out in what looks like a mix between mosquito bites and pimples, I can’t really tell. Some hurt and doesn’t really itch. I feel like it itches more so cause I know I’m having this issue. PROBLEM IS I have no Benadryl in the house, no Claritin anything. SECOND PROBLEM IS I’m in the middle of a snow storm and can’t even leave my house to get medicine. I told cold and flu medicine for the cause it has antihistamines… I think. Idk if that’s even going to do anything. I have no clue what to do I really hope it doesn’t spread