<s>[INST] Hi i just suddenly broke out with a rash on my arms, feet , legs, chest , and back with small red bumps some have swelled up a little other remain flat. It happened after eating a sandwich and grapes from a restaurant which are things I always eat and am not allergic to and I also was sitting by a bamboo tree. Any idea what could have happened? [/INST] Hi dear, it is said that everything under the sun including the sun can cause allergic reaction. So it can be anything, which caused allergy. So it is difficult to say what caused allergy. For now u take antihistamine and apply aloft lotion. I would suggest u not to go near bamboo tree again as I think it's the pollen grains and dust from bamboo which harmed u. as you're used to the above said diet. Thank u </s>