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  1. Acne - Symptoms and causes - Mayo Clinic

  2. Acne: Types, Causes, Treatment & Prevention - Cleveland Clinic

  3. Acne: Treatment, Types, Causes, Prevention, and More - Healthline

  4. What is Acne? Definition & Types | NIAMS

  5. Acne - Diagnosis and treatment - Mayo Clinic

  6. Acne - Wikipedia

  7. The Definitive Guide to Acne: Types, Treatment, and Lifestyle Factors

  8. Acne Basics: Overview, Symptoms, and Causes - National Institute …

  9. Acne: Overview - American Academy of Dermatology

  10. Acne: Diagnosis, Treatment, and Steps to Take - National Institute …