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As per your description,it can be contact allergic reaction or insect bite. you should try some self care remedies until you see your doctor.
Take OTC Advil and Zyrtec.
Also clean the site with antiseptic solution and apply Polysporin ointment with hydrocortisone.
Elevate your leg.
Apply cool compresses if the site is warm and tender to touch.
See your doctor for a clinical exam if your swelling is getting worse.
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