Salicylic acid is a topically applied beta-hydroxy acid that stops bacteria from reproducing and has keratolytic properties.[132][133] It opens obstructed skin pores and promotes shedding of epithelial skin cells.[132] Salicylic acid is known to be less effective than retinoid therapy.[20] Dry skin is the most commonly seen side effect with topical application, though darkening of the skin has been observed in individuals with darker skin types.[1]
Therefore, it is very important that you wear sunscreen everyday, with an SPF of 30.Of note, after SPF 30, there are decreasing marginal returns in UVB protection. The % of UVB protection as a function of SPF Value is a log graph and plateaus after SPF 30. Therefore, there is not much difference in protection between SPF 40 and 50. Sunscreens with an SPF 100 are banned in some countries.
Another once-daily gel your dermatologist might prescribe for acne is Aczone 7.5 percent. The active ingredient, dapsone, is both antimicrobial and anti-inflammatory, and it’s proven to help with blackheads, whiteheads, and deeper painful pimples. Oftentimes, Aczone is used alongside other acne treatments. And like many of those other remedies, Aczone can cause skin to dry out.
If you’re experiencing hormonal acne, acne vulgaris, cystic acne or acne inversa, you should learn the potential sources of your problem. By understanding the cause of your acne, you’ll be better equipped to proactively prevent its formation, rather than just treating it ex posto facto. Watch out for these key acne-inducing factors and their relationship to skin:
How to Handle It: Speaking of touching, don't! Picking it, squeezing it, or poking at it will only worsen the situation. These may disappear on their own after a few days. Otherwise, Zeichner suggests visiting your dermatologist for a shot of cortisone, which will reduce inflammation and shrink it in just 24 to 48 hours. But if a last-minute appointment isn't in the cards, play mad scientist. First, ice the area, and then apply salicylic acid gel, benzoyl peroxide gel, and 1 percent hydrocortisone cream. The combo will calm skin, kill bacteria, and draw out excess oil from the pimple — all things necessary to take this down, says Zeichner.
What's Going On: You might be all too familiar with these, which tend to make their debut when you’re in high school. "Blackheads, like whiteheads, are blocked pores," says Zeichner. What gives them their namesake color, though, is the oil. It's already dark, but blackheads also have a larger opening at the surface than whiteheads do, meaning air can enter and oxidize that oil sitting inside the pore, turning it even darker.
Acne that’s more inflammatory is denoted as moderate acne. This happens when there are occasional nodules and possibly mild scarring. Severe acne occurs when there are a lot of inflammatory lesions, nodules and possibly scarring. It’s also considered severe if the acne is still present after six months of treatment or if it causes serious psychological issues.

Pimples are raised red spots with a white center that develop when blocked hair follicles become inflamed or infected with bacteria. Blockages and inflammation that develop deep inside hair follicles produce cystlike lumps beneath the surface of your skin. Other pores in your skin, which are the openings of the sweat glands, aren't usually involved in acne.
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