<s>[INST] Every now and then...every other week or so....i have a knot that shows up right next to my spine and it itches....in my lower back....by the end of the day it is gone....what could it be? [/INST] HI, Dear,Thanks for the query to Chat Doctor. I understood your concerns about the shin lump. In my opinion its -Urticaria-CIU (Chronic Idiopathic Urticaria)Treatment-a-Take opinion from your ER physicianb-He would do Blood test for eosinophilic / Stool for the worms and amoeba. Hope this would resolve your worry. Hope this would help you to plan the treatment with Your family doctor. Wishing you early recovery. You are always Welcome for further query to Chat Doctor in this regard. Have a Good Day...!! </s>