Although the late stages of pregnancy are associated with an increase in sebaceous gland activity in the skin, pregnancy has not been reliably associated with worsened acne severity.[137] In general, topically applied medications are considered the first-line approach to acne treatment during pregnancy, as they have little systemic absorption and are therefore unlikely to harm a developing fetus.[137] Highly recommended therapies include topically applied benzoyl peroxide (category C) and azelaic acid (category B).[137] Salicylic acid carries a category C safety rating due to higher systemic absorption (9–25%), and an association between the use of anti-inflammatory medications in the third trimester and adverse effects to the developing fetus including too little amniotic fluid in the uterus and early closure of the babies' ductus arteriosus blood vessel.[47][137] Prolonged use of salicylic acid over significant areas of the skin or under occlusive dressings is not recommended as these methods increase systemic absorption and the potential for fetal harm.[137] Tretinoin (category C) and adapalene (category C) are very poorly absorbed, but certain studies have suggested teratogenic effects in the first trimester.[137] Due to persistent safety concerns, topical retinoids are not recommended for use during pregnancy.[138] In studies examining the effects of topical retinoids during pregnancy, fetal harm has not been seen in the second and third trimesters.[137] Retinoids contraindicated for use during pregnancy include the topical retinoid tazarotene, and oral retinoids isotretinoin and acitretin (all category X).[137] Spironolactone is relatively contraindicated for use during pregnancy due to its antiandrogen effects.[1] Finasteride is not recommended as it is highly teratogenic.[1]

Antibiotics are frequently applied to the skin or taken orally to treat acne and are thought to work due to their antimicrobial activity against C. acnes and their ability to reduce inflammation.[20][81][87] With the widespread use of antibiotics for acne and an increased frequency of antibiotic-resistant C. acnes worldwide, antibiotics are becoming less effective,[81] especially macrolide antibiotics such as topical erythromycin.[16][87] Therefore, they are not recommended for use alone but are preferred as part of combination therapy.[15] Commonly used antibiotics, either applied to the skin or taken orally, include clindamycin, erythromycin, metronidazole, sulfacetamide, and tetracyclines such as doxycycline and minocycline.[47] Doxycycline 40 milligrams daily (low-dose) appears to have similar efficacy to doxycycline 100 milligrams daily and has fewer gastrointestinal side effects.[15] When antibiotics are applied to the skin, they are typically used for mild to moderately severe acne.[20] Antibiotics taken orally are generally considered to be more effective than topical antibiotics, and produce faster resolution of inflammatory acne lesions than topical applications.[1] Topical and oral antibiotics are not recommended for use together.[87]

We suggest avoiding spot treatments. “Benzoyl peroxide, when placed on red spots, can actually cause more irritation and inflammation to the area. It’s best used to prevent red bumps and pustules, and applied all over the area you want to treat,” said Townsend, who was also quick to naysay a spot-treat-only approach: “Acne affects all of the pores. If someone is going to spot treat against my advice, I still suggest they spot treat one day and treat the whole face the next.”
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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.
Everything you need to know about cystic acne Cystic acne is an uncommon and severe form of acne. The skin condition results from blocked pores in the skin that cause infection and inflammation. Treatment often requires the help of a specialist doctor who can prescribe potent drugs. Read on to learn about symptoms, causes, diagnosis, and prevention. Read now
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^ White, Stephen D.; Bordeau, Patrick B.; Blumstein, Philippe; Ibisch, Catherine; GuaguÈre, Eric; Denerolle, Philippe; Carlotti, Didier N.; Scott, Katherine V. (1 September 1997). "Feline acne and results of treatment with mupirocin in an open clinical trial: 25 cases (1994–96)". Veterinary Dermatology. 8 (3): 157–164. doi:10.1046/j.1365-3164.1997.d01-16.x. ISSN 1365-3164.
Benzoyl peroxide (BPO) is a first-line treatment for mild and moderate acne due to its effectiveness and mild side-effects (mainly skin irritation). In the skin follicle, benzoyl peroxide kills C. acnes by oxidizing its proteins through the formation of oxygen free radicals and benzoic acid. These free radicals are thought to interfere with the bacterium's metabolism and ability to make proteins.[79][80] Additionally, benzoyl peroxide is mildly effective at breaking down comedones and inhibiting inflammation.[78][80] Benzoyl peroxide may be paired with a topical antibiotic or retinoid such as benzoyl peroxide/clindamycin and benzoyl peroxide/adapalene, respectively.[36]
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:

Combined oral contraceptives. Four combined oral contraceptives are approved by the FDA for acne therapy in women who also wish to use them for contraception. They are products that combine estrogen and progestin (Ortho Tri-Cyclen, Yaz, others). You may not see the benefit of this treatment for a few months, so using other acne medications with it the first few weeks may help.
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