Google the medication below, then go and see a dermatologist (แพทย์ผิวหนัง)
Do not go to a fancy clinic or they will drain your wallet. The medications below cost less than 1000bt for 3 months supply at my local dermatologist.
Isotretonoin+Azithromycin+Topical Clindamycin
To avoid side effects, use a lower dose of Isotrtonoin 10mg daily as it is hard on the liver.
My daughter has medium/severe face only acne and is taking 10mg every other day. After 2 months, it is much better.