Likely a lymph node : There are hundreds of lymph nodes scattered throughout the body which act as sub stations that sift through body serum removing germs and debris. These enlarge and react to localized events like bug bites and skin rashes but can also swell during generalized illness.Occasionally they enlarge to walnut sized and require drainage.Most just do their work and shrink back down within a 3 wk period.
Answered 11/16/2018
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