PTF & sPTF & sPTF+ The propionibacterium acnes (PAC) which causes the inflammatory reaction of skin, is a kind of anaerobic bacteria which produces porphyrin(a sort of photosensitive substance) during metabolism. The special spectrum of GSD PTF & GSD sPTF penetrates deep into skin tissues and is absorbed by porphyrin, stimulates porphyrin to release monomorphism oxyanion which kills propionibacterium acnes effectively, as a result of which, clears acne.