Postinflammatory hyperpigmentation (PIH) is usually the result of nodular acne lesions. These lesions often leave behind an inflamed darkened mark after the original acne lesion has resolved. This inflammation stimulates specialized pigment-producing skin cells (known as melanocytes) to produce more melanin pigment which leads to the skin's darkened appearance.[34] People with darker skin color are more frequently affected by this condition.[35] Pigmented scar is a common term used for PIH, but is misleading as it suggests the color change is permanent. Often, PIH can be prevented by avoiding any aggravation of the nodule, and can fade with time. However, untreated PIH can last for months, years, or even be permanent if deeper layers of skin are affected.[36] Even minimal skin exposure to the sun's ultraviolet rays can sustain hyperpigmentation.[34] Daily use of SPF 15 or higher sunscreen can minimize such a risk.[36]
Benzoyl peroxide attacks the P. acnes bacteria. However, one of its main side effects is dryness: If you’re going to use anything with benzoyl peroxide, make sure to moisturize afterwards. Sulfur and azelaic acid are less common and less severe alternatives to benzoyl peroxide. Dr. Peter Lio, assistant professor of clinical dermatology at Northwestern University, says sulfur-based treatments are “a good fit for patients who can’t tolerate the side effects of benzoyl peroxide.”
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.

It is widely suspected that the anaerobic bacterial species Propionibacterium acnes (P. acnes) contributes to the development of acne, but its exact role is not well understood.[2] There are specific sub-strains of P. acnes associated with normal skin, and moderate or severe inflammatory acne.[49] It is unclear whether these undesirable strains evolve on-site or are acquired, or possibly both depending on the person. These strains have the capability of changing, perpetuating, or adapting to the abnormal cycle of inflammation, oil production, and inadequate sloughing of dead skin cells from acne pores. Infection with the parasitic mite Demodex is associated with the development of acne.[29][50] It is unclear whether eradication of the mite improves acne.[50]


Frequently used topical retinoids include adapalene, isotretinoin, retinol, tazarotene, and tretinoin.[46] They often cause an initial flare-up of acne and facial flushing, and can cause significant skin irritation. Generally speaking, retinoids increase the skin's sensitivity to sunlight and are therefore recommended for use at night.[1] Tretinoin is the least expensive of the topical retinoids and is the most irritating to the skin, whereas adapalene is the least irritating to the skin but costs significantly more.[1][84] Tazarotene is the most effective and expensive topical retinoid, but is not as well-tolerated.[1][84] Retinol is a form of vitamin A that has similar but milder effects, and is used in many over-the-counter moisturizers and other topical products.
Side effects include increased skin photosensitivity, dryness, redness and occasional peeling.[81] Sunscreen use is often advised during treatment, to prevent sunburn. Lower concentrations of benzoyl peroxide are just as effective as higher concentrations in treating acne but are associated with fewer side effects.[80][82] Unlike antibiotics, benzoyl peroxide does not appear to generate bacterial antibiotic resistance.[81]

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.


Frequently used topical retinoids include adapalene, isotretinoin, retinol, tazarotene, and tretinoin.[46] They often cause an initial flare-up of acne and facial flushing, and can cause significant skin irritation. Generally speaking, retinoids increase the skin's sensitivity to sunlight and are therefore recommended for use at night.[1] Tretinoin is the least expensive of the topical retinoids and is the most irritating to the skin, whereas adapalene is the least irritating to the skin but costs significantly more.[1][84] Tazarotene is the most effective and expensive topical retinoid, but is not as well-tolerated.[1][84] Retinol is a form of vitamin A that has similar but milder effects, and is used in many over-the-counter moisturizers and other topical products.
Also, refrain from moisturizing as you’ll want your face clear of even beneficial elements. Then, in the morning, gently press the blotting paper to the different areas of the face that you want to check. Don’t rub your skin with the paper as this will cause irritation, so instead just blot. The result will be that you’ll be able to see the amount of oil that is present in the different areas of your skin.

But Accutane has mixed reviews for a reason. It makes the skin super dry and sensitive, which means it’s important to keep moisturizers and lip balm nearby while you’re on the treatment. Oh, and don’t even think about waxing your eyebrows (just imagine your skin ripping off). There’s another downside to Accutane: It requires a lot of paperwork and office visits. Since isotretinoin can cause birth defects, you have to come into the dermatologist once a month to get a pregnancy test and take a lengthy survey with embarrassing questions about your sex life to prove that you are using sufficient birth control. These precautions are intense, but dermatologists agree that the final results for Accutane are like no other. “This is one of the few medicines that I can look [patients] in the eye and guarantee them it will work,” says Friedman.

In women, acne can be improved with the use of any combined birth control pill.[89] These medications contain an estrogen and a progestin.[90] They work by decreasing the production of androgen hormones by the ovaries and by decreasing the free and hence biologically active fractions of androgens, resulting in lowered skin production of sebum and consequently reduced acne severity.[10][91] Although oral estrogens can decrease IGF-1 levels in some situations and this might be expected to additionally contribute to improvement in acne symptoms,[92][93] combined birth control pills appear to have no effect on IGF-1 levels in fertile women.[90][94] However, cyproterone acetate-containing birth control pills have been reported to decrease total and free IGF-1 levels.[95] Combinations containing third- or fourth-generation progestins including desogestrel, dienogest, drospirenone, or norgestimate, as well as birth control pills containing cyproterone acetate or chlormadinone acetate, are preferred for women with acne due to their stronger antiandrogenic effects.[96][97][98] Studies have shown a 40 to 70% reduction in acne lesions with combined birth control pills.[91] A 2014 review found that antibiotics by mouth appear to be somewhat more effective than birth control pills at decreasing the number of inflammatory acne lesions at three months.[99] However, the two therapies are approximately equal in efficacy at six months for decreasing the number of inflammatory, non-inflammatory, and total acne lesions.[99] The authors of the analysis suggested that birth control pills may be a preferred first-line acne treatment, over oral antibiotics, in certain women due to similar efficacy at six months and a lack of associated antibiotic resistance.[99]
Cysts are another troublesome type of acne to treat successfully without the help of a doctor. A cyst forms similar to a nodule—way beneath your skin’s surface. However, cysts are thought to form from pustules because they contain pus. They are painful when touched resemble a boil. They appear to be a large, red, swollen lump on the skin surface. People who are prone to them may get one large cyst or a clump of cysts.
Pustules, as their name suggests, are filled with pus. They usually have a white or yellow center surrounded by extremely inflamed skin that is pink or red. The pus isn’t just bacteria and skin cells—it contains some dead white blood cells that were trying to fight the bacteria, too. Squeezing these can cause the skin around them to darken and scar.
Atrophic acne scars have lost collagen from the healing response and are the most common type of acne scar (account for approximately 75% of all acne scars).[31][32] They may be further classified as ice-pick scars, boxcar scars, and rolling scars.[30] Ice-pick scars are narrow (less than 2 mm across), deep scars that extend into the dermis.[31] Boxcar scars are round or ovoid indented scars with sharp borders and vary in size from 1.5–4 mm across.[31] Rolling scars are wider than icepick and boxcar scars (4–5 mm across) and have a wave-like pattern of depth in the skin.[31]
Flutamide, a pure antagonist of the androgen receptor, is effective in the treatment of acne in women.[101][108] It has generally been found to reduce symptoms of acne by 80 or 90% even at low doses, with several studies showing complete acne clearance.[101][109][110] In one study, flutamide decreased acne scores by 80% within 3 months, whereas spironolactone decreased symptoms by only 40% in the same time period.[110][111][112] In a large long-term study, 97% of women reported satisfaction with the control of their acne with flutamide.[113] Although effective, flutamide has a risk of serious liver toxicity, and cases of death in women taking even low doses of the medication to treat androgen-dependent skin and hair conditions have occurred.[114] As such, the use of flutamide for acne has become increasingly limited,[113][115][116] and it has been argued that continued use of flutamide for such purposes is unethical.[114] Bicalutamide, a pure androgen receptor antagonist with the same mechanism as flutamide and with comparable or superior antiandrogenic efficacy but without its risk of liver toxicity, is a potential alternative to flutamide in the treatment of androgen-dependent skin and hair conditions in women.[106][117][118][119]
What it does: Benzoyl peroxide is the only known substance which can bring oxygen under the skin surface. Since bacteria cannot survive in the presence of oxygen, when used in an adequate dosage, benzoyl peroxide eradicates 99.9% of these bacteria almost immediately. It also exerts a mild drying and peeling effect, which is thought to help prevent breakouts.1-6 Benzoyl peroxide also helps lessen inflammation.7-9 2.5% benzoyl peroxide is just as effective as higher concentrations with less side effects.6,10
Sodium sulfacetamide-sulfur is another acne medications often found in over-the-counter treatments, and it works especially well for those with mild-moderate acne that is largely made up of pimples. This is because it effectively dries out excess sebum without drying out the skin, and some studies suggest that this combination of sodium sulfacetamide and sulfur has antibacterial properties. According to one study published in The Journal of Clinical and Aesthetic Dermatology, sodium sulfacetamide 10 percent-sulfur 5 percent can significantly reduce the size of p. acnes colonies when used as an emollient foam6. This treatment option is also available as a facewash, topical gel, and topical cream, and can be found at most drugstores.

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It is widely suspected that the anaerobic bacterial species Propionibacterium acnes (P. acnes) contributes to the development of acne, but its exact role is not well understood.[2] There are specific sub-strains of P. acnes associated with normal skin, and moderate or severe inflammatory acne.[49] It is unclear whether these undesirable strains evolve on-site or are acquired, or possibly both depending on the person. These strains have the capability of changing, perpetuating, or adapting to the abnormal cycle of inflammation, oil production, and inadequate sloughing of dead skin cells from acne pores. Infection with the parasitic mite Demodex is associated with the development of acne.[29][50] It is unclear whether eradication of the mite improves acne.[50]
Pharaohs are recorded as having had acne, which may be the earliest known reference to the disease. Since at least the reign of Cleopatra (69–30 BC), the application of sulfur to the skin has been recognized as a useful treatment for acne.[162] The sixth-century Greek physician Aëtius of Amida is credited with coining the term "ionthos" (ίονθωξ,) or "acnae", which is believed to have been a reference to facial skin lesions that occur during "the 'acme' of life" (puberty).[163]
Oral contraceptives can help normalize hormonal surges and regulate monthly cycles so that oil glands don’t go into overdrive, says Dr. Zeichner. Doctors may prescribe one of four brands of birth control pills—Yaz, Beyaz, Estrostep, and Ortho Tri-Cyclen—that are FDA approved for treating acne. As always, patients taking oral contraceptives should be aware of potential birth control side effects, including blood clots or vaginal dryness.
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.[19] 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]
“You unfortunately cannot determine the strength of a product strictly by the percentage of its active ingredients because how well a product works depends on how well its inactive ingredients help it penetrate the skin,” explains Dr. Green. “In other words, a 2 percent benzoyl peroxide may be more effective than another brand’s 5 percent benzoyl peroxide because there are other ingredients helping out.”
Most studies of acne drugs have involved people 12 years of age or older. Increasingly, younger children are getting acne as well. In one study of 365 girls ages 9 to 10, 78 percent of them had acne lesions. If your child has acne, consider consulting a pediatric dermatologist. Ask about drugs to avoid in children, appropriate doses, drug interactions, side effects, and how treatment may affect a child's growth and development.
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