Acne inversa (L. invertō, "upside down") and acne rosacea (rosa, "rose-colored" + -āceus, "forming") are not true forms of acne and respectively refer to the skin conditions hidradenitis suppurativa (HS) and rosacea.[25][26][27] Although HS shares certain common features with acne vulgaris, such as a tendency to clog skin follicles with skin cell debris, the condition otherwise lacks the defining features of acne and is therefore considered a distinct skin disorder.[25]
Tretinoin: As we said above, tretinoin (common brand name: Retin-A) is a synthetic retinoid, but it is stronger than some of the other options, and its cousin, isotretinoin, is even stronger. Isotretinoin, better known as Accutane, is an oral synthetic retinoid typically only prescribed for very severe cases of cystic acne because it can cause intense side effects and is a powerful teratogen, meaning it causes birth defects. However, after taking isotretinoin for several months, many people never need to do any serious acne treatment again, so for some, it is well worth the side effects.

Acne vulgaris Acne conglobata Acne miliaris necrotica Tropical acne Infantile acne/Neonatal acne Excoriated acne Acne fulminans Acne medicamentosa (e.g., steroid acne) Halogen acne Iododerma Bromoderma Chloracne Oil acne Tar acne Acne cosmetica Occupational acne Acne aestivalis Acne keloidalis nuchae Acne mechanica Acne with facial edema Pomade acne Acne necrotica Blackhead Lupus miliaris disseminatus faciei

Both salicylic acid and benzoyl acid are commonly found in the top acne treatments for getting rid of mild to severe acne. They work in tandem to getting rid of the dead skin and killing bacteria, which are two of the main contributors to the spread of acne. Salicylic acid breaks up the skin to clear pores from skin, oil and bacteria and benzoyl peroxide kills the bacteria slowly over a 48-hour period.
How to Handle It: Your best bet is benzoyl peroxide. "Benzoyl peroxide can kill acne-causing bacteria and reduce inflammation," says Zeichner. Try a cream like the La Roche-Posay Effaclar Duo Dual-Action Acne Treatment ($37), which also exfoliates with lipo-hydroxy acid. Be aware that it can seriously dry out skin so moisturize well after you use it.
The theory behind Exposed Skin Care’s acne treatment is that clean skin means clear skin. Their acne facial cleanser provides a deep but gentle cleansing of facial skin that’s soap-free, non-comedogenic, and hypoallergenic. It removes oil and dirt from your face and penetrates your pores while eliminating acne-causing bacteria. Furthermore, it maintains your skin’s lipid layer while helping to keep skin smooth.
Decreased levels of retinoic acid in the skin may contribute to comedo formation. To address this deficiency, methods to increase the skin's production of retinoid acid are being explored.[10] A vaccine against inflammatory acne has shown promising results in mice and humans.[49][180] Some have voiced concerns about creating a vaccine designed to neutralize a stable community of normal skin bacteria that is known to protect the skin from colonization by more harmful microorganisms.[181]
Acne appears when a pore in our skin clogs. This clog begins with dead skin cells. Normally, dead skin cells rise to surface of the pore, and the body sheds the cells. When the body starts to make lots of sebum (see-bum), oil that keeps our skin from drying out, the dead skin cells can stick together inside the pore. Instead of rising to the surface, the cells become trapped inside the pore.
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