<s>[INST] I have a rash that started on my lower legs, and now is also on my upper legs and arms. It isn t on the rest of my body. It is not welts or obvious spots, but I can feel the bumps when I run my fingers over it. It is extremely itchy and keeps me awake at night. Benadryl doesn t works that well. I am at my wits end. [/INST] Hi welcome to Chat Doctor forum. From your description it appears that it is not an allergy but is an infection, of either bacterial or fugal. So you need to use antibiotics or antifungals for cure.  I advise you to consult a dermatologist for diagnosis and treatment. If your skin is Chat Doctor.  Take balanced diet and nourishing food to make the skin healthy, and sea that the hemoglobin is up to the mark.  Wishing for a quick and complete recovery. I thank you for calling. </s>