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AcneNet: "What Causes Acne?," "AcneNet Glossary," "Prescription Medications for Treating Acne," "Treating Severe Acne."
National Institute of Arthritis and Musculoskeletal and Skin Diseases: "Q&A Acne." "What Is Acne?"
Gold, M. Journal of Clinical and Aesthetic Dermatology, April 2009; vol. 2: pp 40-44.
Jacoby, David B., and R. M. Youngson. Encyclopedia of Family Health. New York: Marshall Cavendish, 2004; pp 32.
O'Connor, Daniel P., and Fincher, A. Louise. Clinical Pathology for Athletic Trainers: Recognizing Systemic Disease. Thorofare, NJ: SLACK Incorporated, 2008; pp 300.