Good morning, I have been struggling with troublesome acne for 7 years, I have already undergone antibiotic therapy (Tetralysal), isotretinoin (Axotret) and specifics such as Epiduo, zinc ointment, Duac, etc. All these methods of treatment gave short-term effects - after the last isotretinoin therapy, the changes returned immediately after discontinuation of drugs, currently I do not use any dermatological specifics, I only go to regenerative treatments to the beautician but the condition of the skin, unfortunately, does not improve on the contrary-every morning I wake up with a new "surprise" on the face, purulent pimples and blackheads occur most in the area between the upper lip and nose, On the nose and on the cheeks near the nose, I feel discomfort in these places - itching, itching. I am considering extending the diagnostics but I do not know where to start and what should I examine to identify the source of acne, which specialists should I go to and what tests should I do?