Several weeks ago I received a sample of Icy Hot Medicated Patch from Walmart. Not thinking much about it I put in my sample basket for later use. I frequently have lower back pain, and usually use a heating pad or just take a couple ibuprofen to alleviate the pain. Last Thursday night my back was hurting pretty bad and I remembered I had the Icy Hot Patch. I read the instructions which are very easy and applied the patch to my lower back for 8 hours. It felt great! My back immediately began to feel better. I took the patch off after 8 hours and really didn't think about it very much after that. Tuesday my back started itching, and I couldn't figure out why. It bothered me the entire day, but I didn't say anything about it to anyone. After arriving home I asked my son & daughter to look at my back. They both gasped! My daughter who had helped me apply the patch immediately said "Mom there are little red bumps in a rectangle the size of that patch you used!" Well the last two days have been horrible. My back itches, burns, and is driving me literally crazy! I've used benadryl cream, and I even took benadryl pills. I just want everyone to know to stay away from this product. Hopefully this will eventually go away, but enduring it is definitely irritating.