A 15 year old male presents with red rash to his face and up…

A 15 year old male presents with red rash to his face and upper back that has been intermittent for over a year.  He states they do not itch and he has attempted to pop the lesions which produce a white discharge.  Upon exam, you see multiple erythematous papules on the chin, forehead, and upper back. There is also evidence of scarring.  The best differential diagnosis would be: