<s>[INST] For the last 7-10 days, I have had pain in the upper left portion of my back, like a pulled muscle.  I keep taking Bayer Back and Body at night because I can't sleep unless I do.  Then, about 4 days ago, the same area started itching; I thought it was dry skin from heating the house for the winter.  I asked my husband to put hand lotion on my back, and he said, "Oh, my God!  You have two huge whelps on your back and a bunch of smaller red dots to the left.  The pain that has come with it is like a sunburn. [/INST] HiThank you for asking HCMYour problem can be due to herpes zoster. If you send the picture of lesion then it will be more helpful. In such case applying acyclovir cream and taking antiviral drugs like valacyclovir will be helpful.Thanks </s>