I was outdoors for a long time yesterday and now have a rash on back of neck and on back that is quite itchy.  Not sure what caused it. Could be from some insect?  Not sure if could be shingles or maybe allergic to a nicklace I was wearing.  How to narrow it down and find out what it is.
Hello, Shingles present with severe pain and burning along with fluid-filled blisters in one dermatome of the body. You seem to be having either insect bite hypersensitivity reaction or allergic reaction. I would recommend you to apply cortisone cream on the affected areas twice daily along with antihistamines like tablet chlorpheniramine male ate once or twice daily depending on the intensity of itching. Hope I have answered your query. Let me know if I can assist you further. Take care Chat Doctor.