legend---That is a different kind of swelling.They tell you not to
scratch Poison Ivy or not rub it because a liquid will come out &
spread the infection.With this kind of swelling;you rub the swollen
area;a liquid;comes out and; in most cases;the swelling goes down!Just a medical remedy to offer assistance.It has;worked;at least temorarily;for me.That's why they call me;Dr. Irish Irish

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Irish---Better to be dead & cool,then alive & uncool!
(Harley Davidson & the Marlboro Man)