I had PDT, which is effective in reducing sebum production, because of my occasional acne + oily face. The procedure was extraction + PDT + sedation. There was no pain at all except for the stinging sensation when applying the PDT solution after extraction + extraction. The PDT effect was immediate. I felt like my oiliness had decreased from the next day? The frequency of acne also decreased after that. I think I need to get it done 3~5 times to eradicate acne.