Is this Acne or Acne Keloidalis? (photos)

These acne like bumps on my chin won't go away no matter what!! I have tried Biacna and Tactuo, they did not work. The dermatologist said its closed comedones but I believe it's an acne like rash or scarring from past pimples and picking of the skin when I was younger. I do get a large pimple on my chin from time to time. The bumps are stubborn and They are not filled with anything. If you stretch the skin it goes flat. Please help me diagnose this & possible treatments! I feel hideous.

No doctor answers yet