Adult Acne Sudden onset, or continuation of acne, during adulthood may be caused by hormone imbalances, stress, pollution or medications. This type of acne causes acne on the chest and back, severe acne scarring, fluctuating fever, painful joints, loss of appetite or weight, and a high white blood cell count. This acne is caused by the use of testosterone legally or illegally to enhance muscle growth. Over the counter treatments for this type of acne are not effective. Studies have shown a direct link between hormone imbalances and the onset of acne in women ages 30 to 40 years old.

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