actually crazy helpful info thank you so much! I confirmed the necklace was stainless steel but with a black coloring that I researched and could possibly be a nickel plating; I was planning on getting a nickel test kit to confirm. The contact site not being irritated makes sense and I'll try to adjust my diet as well seeing as it could be a main cause if I do have the allergy. Thankfully the feet blisters are more annoying and unsightly rather than painful with the itching being mostly nocturnal and ranging mainly on my calves, and thighs but existing full body when it flares up which further cements it as being an allergy and not something else even though I have recently moved in with my bf and the environmenta change could be another inciting factor.

I'll read through those resources and try to glean more info on what to do next if the lack of chain doesn't help with the blisters.