The term acne cosmetica refers to acne caused by or aggravated by cosmetics.:240 The mechanism was presumably a chemically induced plugging of the pilosebaceous orifice. This became a significant problem for dermatologists in the 1970s and 1980s, but with the improved formulations produced by cosmetic chemists over the past thirty years[update], a diagnosis of acne cosmetica has become relatively rare daily dermatological practice.
The terms "non-comedogenic" and "non-acne(i)genic" appeared on moisturizers and other cosmetic compounds as manufacturers introduced re-formulations—sometimes associated with claims that the products were "oil-free" or "water-based". Although early work produced lists of comedogenic chemicals in various strengths and vehicles, it became apparent[to whom?] that one could not predict the actual comedogenicity of a product from its contents; rather, the finished product itself needed use-testing.
The production of a low-grade folliculitis by some components of cosmetic products has led to misdiagnosis on occasion.
Reactions occur more commonly if applied cosmetics are let to sit and are not stripped after use.
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