How do I cure my adult cystic acne on chin?

I am a 26 years old girl, I still get adult cystic acne specially on my chin area. I am getting acne from the age of 12. I have consulted many dermatologists and nothing seem to work. My doctor had doubted me to have PCOS. While in the ultrasound my doctor found very rare cysts in the ovaries, my all blood tests for hormones came out to be normal. I do not understand how I can cure the acne permanently. My chin area has become dark.

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