My son has been using it for 1.5 months according to the instructions, it didn't really show itself, it seemed to me that it gives only a short-term effect, and then everything returns. Of course, azelaic acid should dry the skin a little, but it would not be for nothing if there was a real effect. Now we are engaged in restoring the skin from dryness. What are your impressions and experience? SHOULD we continue this course or look for something new?