<s>[INST] Good Day,I went to a friend's house for Christmas dinner and I ate something that caused me to have an allergic reactions. Small bumps became visible on my lips. I'm not sure what I ate that caused it but I'm thinking it could have been the mash potatoes as I suspect the mayonnaise used might have been expired. Can Histatussin be used to assist with this problem or will the bumps go on their own its been 2 days now [/INST] Hello,It seems that probably you may be having urticaria. Consult the dermatologist for the perfect diagnosis and proper treatment. You may take fexofenadine daily for a long time. And avoid suspected dietary allergens in diet.Hope I have answered your query. Let me know if I can assist you further.Regards,      Dr. Ilyas Patel </s>