an inflammatory lesion commonly develops in certain organs ( e.g . skin , brain , kidneys and joints ) either when antigen in the tissue spaces reacts with precipitating antibody forming microprecipitates in and around small blood vessels or when antigen in excess in the blood stream reacting with potentially precipitating antibody forms immune complexes ( ics ) that lodge in the blood vessels .
C0003241
antibody
C0003313
immune complexes