hi jw,
I also had 碳粉laser few months ago by doctor, effect quite good, skin smooth and soft after that, the 毛孔 got smaller and much less oily face. Some of my friends then also tried it, got good results.
But one of my friend also had it, but her response is much slower.
And usually the response can't be so obvious in first one to two treatment. The early improvement usually is less oil.