<human>: for the last two months i have a rash that comes and goes. some are red and clustered together and others are like welts. i thought it was poison ivy and got a steroid shot and week worth of medication but they still come and go. it is not painful but i wake up at night from the itching. creams do not work. Calvin
<bot>: Hello, Thank you for asking at Chat Doctor. I went through your history and would like to make suggestions for you as follows:1. As you have rash for more than 2 months, I would first think of "chronic urticaria". 2. There are many possible causes of chronic urticaria and I usually suggest my such patients investigations like complete blood counts, ESR, CRP, serum total IGE, urine and stool examination. I also add tests like serum SGPT, serum proteins, thyroid tests, serum ANA etc. if patients detailed history suggests they could be useful.3. For treatment purpose, I usually suggest my such patients antihistamines like cetirizine or levocetirizine in morning and HY Chat Doctor. 4. I would also suggest you regular application of calamine lotion over 