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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.[35] People with darker skin color are more frequently affected by this condition.[36] 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.[37] Even minimal skin exposure to the sun's ultraviolet rays can sustain hyperpigmentation.[35] Daily use of SPF 15 or higher sunscreen can minimize such a risk.[37]
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Oral isotretinoin is very effective. But because of its potential side effects, doctors need to closely monitor anyone they treat with this drug. Potential side effects include ulcerative colitis, an increased risk of depression and suicide, and severe birth defects. In fact, isotretinoin carries such serious risk of side effects that all people receiving isotretinoin must participate in a Food and Drug Administration-approved risk management program.
Perioral dermatitis Granulomatous perioral dermatitis Phymatous rosacea Rhinophyma Blepharophyma Gnathophyma Metophyma Otophyma Papulopustular rosacea Lupoid rosacea Erythrotelangiectatic rosacea Glandular rosacea Gram-negative rosacea Steroid rosacea Ocular rosacea Persistent edema of rosacea Rosacea conglobata variants Periorificial dermatitis Pyoderma faciale
A major mechanism of acne-related skin inflammation is mediated by C. acnes's ability to bind and activate a class of immune system receptors known as toll-like receptors (TLRs), especially TLR2 and TLR4.[45][64][65] Activation of TLR2 and TLR4 by C. acnes leads to increased secretion of IL-1α, IL-8, and TNF-α.[45] Release of these inflammatory signals attracts various immune cells to the hair follicle including neutrophils, macrophages, and Th1 cells.[45] IL-1α stimulates increased skin cell activity and reproduction, which in turn fuels comedo development.[45] Furthermore, sebaceous gland cells produce more antimicrobial peptides, such as HBD1 and HBD2, in response to binding of TLR2 and TLR4.[45]

When it comes to dealing with other people, many of us find ourselves helplessly oscillating between anger and fear. We constantly try to find quick fixes to soothe moments of blind rage and alleviate anxious thoughts. However, these “solutions” are usually nothing more than temporary fixes, which allow us to white knuckle it through one more day. Meanwhile, the root of the problem continues to fester and get worse until we can’t even bear to look at it anymore.


But the milder cases can benefit from some topical over-the-counter treatments, too: “OTC options should be limited to when you have only one or two cysts,” though, says dermatologist Noelani Gonzalez, the director of cosmetic dermatology at Mount Sinai West. “Otherwise you should go see your dermatologist sooner than later to avoid any scarring.” Here, we spoke with three dermatologists to hear more about the most effective cystic-acne treatments to use at home.
Oral isotretinoin is very effective. But because of its potential side effects, doctors need to closely monitor anyone they treat with this drug. Potential side effects include ulcerative colitis, an increased risk of depression and suicide, and severe birth defects. In fact, isotretinoin carries such serious risk of side effects that all people receiving isotretinoin must participate in a Food and Drug Administration-approved risk management program.
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