The word comedogenic refers to the action that a product exerts when it causes certain imperfections known as comedones (blackheads and whiteheads), this product is called comedogenic. Therefore, any product called non-comedogenic is one that does not obstruct or plug the pores of the skin. Comedogenicity is the ability of some products, drugs, or other substances such as anabolic steroids, to develop acne blackheadsThese blackheads are basic lesions or wounds of acne vulgaris, as a result of the accumulation and increase of sebum and keratin in the exit orifices of a hair follicle. These spots are black due to the oxidation of the sebum, but not due to the presence of dirt on them. Comedones can be open, which are known as blackheads, or they can also be closed in which the pore cannot be seen and come from inflammatory skin lesions.
Now, non-comdogenic products or drugs are those that due to their composition do not help the appearance of these comedones, whether they are blackheads or whiteheads, or the complication of acne. A cosmetic product that has viscosity, or is unctuous, does not necessarily have to be comedogenic since very well a liquid product could be more comedogenic than one that is denser.
Many cosmetic products do not include certain comedogenic ingredients such as wheat germ oil, Cetyl alcohol (emollient), Myristyl Myristate (conditioner), Isopropyl Myristate, Oleth-3, among others. A cosmetic product is classified as non-comedogenic and obtains this title after passing through a series of tests and studies.