This is not a Loxosceles reclusa envenomation. White area as well as the rash discredit the claim. Here is some scholarly information regarding recluse necrotism. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4902007/#!po=2.94118
In subreddit r/oddlyterrifying
In a post titled:
Brown Recluse spider bite while sleeping 7O% of body went into a rash from mildlyinteresting.