At 1 month , 90 % clearance or moderate improvement occurred in 46/50 ( 92 % ) , 29/50 ( 58 % ) and 22/50 ( 44 % ) patients in the PDT , IPL and LED groups , respectively ( mean number of sessions required , PDT : 31.52 ; IPL : 62.15 ; LED : 93.34 ) .