Unless you saw the spider bite you, that swollen, bite-looking lesion on your arm is probably something else, and blaming it on an innocent 8-legged critter might do more harm than good.
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Sources:
http://ipm.ucanr.edu/PMG/PESTNOTES/pn7468.html
http://ipm.ucanr.edu/PMG/PESTNOTES/pn74149.html
http://www.derm.city/single-post/2017/02/22/NOT-RECLUSENew-mnemonic-to-prevent-misdiagnosis-of-skin-conditions-as-spider-bites
http://www.idph.state.il.us/envhealth/pcreclusespiders.htm
https://entomology.ca.uky.edu/ef631