What Causes Acne?
Acne Is Likely Caused by Multiple Factors, Including Hormones, Inflammation, Evolutionary Biology, Stress, Vitamin Deficiency, and Diet, Amongst Others
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Acne Dysmorphia
A Rare and Debilitating Mental Illness, Similar to Anorexia Nervosa
The Role of Sebum (Skin Oil) in Acne
Generally Speaking, More Sebum = More Acne. Also, When the Composition of Sebum Goes Awry, That May Also Lead to Acne.