The Committee for the Defense of Political Prisoners has posted photos of Faraji's welt-covered back after the sentence was carried out.
Faraji reportedly has also been given a three-year suspended prison sentence and a fine.
Unlike the lashing sentence that was carried out last week against a female doctoral student of sociology that received lots of attention and condemnation, Faraji's sentence has gone largely unnoticed.
Iran has ordered that a number of rights activists and workers be lashed in recent years, although in at least some cases those sentences were suspended.
In 2008, at least four workers who had took part in May Day celebrations and called for greater rights were lashed for "disrupting public order and participating in an unauthorized gathering."
-- Golnaz Esfandiari