<s>[INST] i have a red itchy rash that comes and goes that s not on a regular basis but it appears on my arms, legs, feet , and hands. I went to the school nurse a few times and they said it looks like contact dermatitis from washing my hands, but i don t wash my legs too. There isn t really any changes in my soaps or lotions anything like that either. I don t know what to do because if i go to the doctors office it is not always on my body. [/INST] Hi, From the description you have given it seems more like urticaria than contact dermatitis. In most of the cases, urticaria has no underlying cause. However worm infestation, particular food intake, foods with preservative like jams pickle and sauce, medicines, infections can cause urticaria. To treat the same, you might require a course of oral anti allergic like fexofenadine or cetirizine for couple of weeks. You can also apply calamine to soothe rashes. Hope that answers your query. Take care. </s>