<s>[INST] I had a sudden rash break out overnight at the creases on both arms and a few spots along the lower right arm. I have been applying cortisone cream, but am wondering could this be an allergic reaction to foods eaten at a Mexican restaurant last evening? [/INST] Hi, Yes. foods are one of the commonest causes of allergy. You can take a dose of antihistamine tablet. But, I recommend you to consult your dermatologist as soon as possible for further management. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. Siva Subramanian, Dermatologist </s>