Open, Closed, WTH Are Comedones?

Before you start stressing that there’s a new type of pimple about to pop up on your face, take a deep breath. You’re probably already familiar with both open and closed comedones, just by different names. Let’s keep it simple. Open comedones are blackheads. Closed comedones are under-the-skin whiteheads. A closed comedo that lies deep within the skin is called a blind pimple.
Comedonal acne develops when pores (aka hair follicles) become clogged with excess sebum and dead skin cells. Each follicle contains one hair and a sebaceous gland, which produces oil. When dead skin cells and oils collect in the follicle opening, a bump (or a comodo) is formed. If the skin covering the comodo remains closed, the bump is called a closed comedo or whitehead. If the skin covering the comodo opens, it turns black from exposure to air and is known as a blackhead or open comodo.
RELATED READ: 3 Reasons Why Your Skin Is Breaking Out
How to treat comedones
Now, onto the important part – what to do about comedonal acne. Since they are different types of acne, you’ll want to treat open and closed comedones differently.
Not to be confused with acne or whiteheads, milia are tiny spots or cysts that appear under the skin. They are sometimes referred to as “milk spots.” Milia are comprised of keratin, a protein on the outer layer of the skin, that collects and becomes trapped in a pore. While milia will often go away on their own after a few months, common treatments to expedite the process include gentle exfoliation and chemical peels.
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