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First contact Machiguenga chief reducing inflammation of our feet by black sand fly bites using plant poultice, Lower Andean, Amazon Basin, Peru, 1986 This worked when our expedition physician used cortisone drugs and salve which failed to reduce inflammation which swelled our faces and feet and we couldnÕt walk. The leaves the chief used were of the Begonia species, Begonia sp., First contact of new band of remote Machiguenga Indians. (Photo by: Education Images/Universal Images Group via Getty Images)