Walt: It was "probably" the very soft tender location.
Had you taken any anti-inflamatory agents, aspirin. ibuprofen, percoset, etc.
in the 24-48 hours prior to the sting?   Anti-inflamatory agents negate ones
built up
tolerance of sting trauma.
Why not go out today, make a bee sting the end of your finger, and observe the
results.  If your arm swell, so an allergist and hospital today and be
checked.
I get stung on purpose once each day, even Christmas Day, to maintain by built
up immunity (like getting a booster shot once a year for tetanus).  Hence, if
I do get 30-50 stings quickly, everything is OK.  It helped tremendously when
I worked with AHB in Brazil.
My guess is you are OK, but it is better to inquire and maybe do a tiny self
experiment.                                            George Imirie