<s>[INST] I have shiitake mushroom rash. I recently ingested some of the mushrooms at a restaurant. I began itching the following day. Each day the rash gets angrier and more intense. I have a scratch like rash all over my body. Huge raised long scratch looking marks. I have had the symptoms for nearly two weeks. I take allergy medication which takes the edge off, but does seem to completely get rid of the symptoms. I have teribble outbreaks and i do not know what iginites them. Once they start, they are there for hours and I itch the whole day. Starts on back of hands, feet, then scalp, then neck, and then all over my back. Is there some sort of detox that I can do to get this out of my system? Anything make it go away? I have no other allergies. I am not on any medications [/INST] Hello, Thank you for posting on Chat Doctor. The condition you have referred to is called Urticaria or hives. It's an allergic manifestation of skin, where an allergen leads to release of certain substances from your blood, leading to itchy skin rash and swelling over soft tissues. Its proper management requires thorough history, clinical and laboratory work-up. You may have to go for specific tests like patch test, food prick test, IGE antibody levels etc. As for treatment part, best would be the avoidance of allergen as far as possible. Try to eliminate possible triggering foods from diet. I would also advise you various antihistamines for long duration(at least 3 months) with or without oral corticosteroids. For non-responding cases there are many other Chat Doctor.  Hope this will help you in resolving your query. Thank you  </s>