What does comedogenic and non-comedogenic mean

You must have heard these terms while searching for some product reviews. You must have heard people saying that some products are non-comedogenic. Ever wondered what does comedogenic and non-comedogenic mean.
Comedogenic word comes from a word ‘comedo’, the least severe form of acne, is the result of a clogged pore [source: American Academy of Dermatology].  So word comedogenic mean pore clogging. Human skin has enormous pores. Our skin secrete natural oil is called as sebum that helps maintaining skin moisture. But sometimes skin secrete excessive sebum causes pore clogging that traps bacteria and dead skin cells inside your skin leading to acne prone skin.
What does exactly comedogenic and non-comedogenic products mean?

As I said comedogenic means pore clogging so when a product claims to be non comedogenic it means that product will not cause acne. That product does not contain any such ingredient which will clog your pore and leads acne.
But do remember that using non comodegenic product does not mean you will never get acne because acne occurs from different other factors such as hormones, lifestyle etc.
refer – What is Acne? Acne Causes and Treatments
It will ensure that you will not get acne because of that particular product.
So always prefer the non-comedogenic product to be on safe side.
Now there are terms like mildly comedogenic and high comedogenic. Every ingredient is different in this aspect. We can measure them on comedogenecity factor. Where 0 being non comedogenic to 2 being mildly comedogenic and 5 means highly comedogenic. So mildly comedogenic products will not have any major effect on people having less acne and can be used on low level .
Highly comedogenic means it will highly likely to clog pores so people with even a less acne should avoid it.
Below are some examples of the most used ingredients:
Non comedogenic  0 – Argan oil,  Zinc oxide, Glycerine, shea butter
Low comedogenic  1 –  Castor oil, jojoba oil
Mildly comedogenic 2 – Almond oil , sesame oil, Jojoba oil, Olive oil
Highly comedogenic  4 to 5 –  Wheat germ oil, coconut oil, cocoa butter, Soybean oil, Isopropyl palmitate, Isopropyl myristate

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