Thread: what am I allergic to?

for about 4 months now I have had this red bumpy rash on my arms. it's not that bad and sometimes it's worse than at other times. it is basically a few red bumps under my arm and under my armpit that itch like crazy and are pretty annoying. and I got this rash after wearing a shirt that was in the garage in a garbage bag.

and the second rash I have is in the groin area. it is red bumpy and itchy and looks really pinkish. it has been there for about 3 weeks and I got it after wearing my new swimsuit for about 3 hours after swimming and not washing it before I wore it

what could these rashes be?
2 seperate rahes they both look different

Put apple cider vinegar on it...