The recognition and characterization of acne progressed in 1776 when Josef Plenck (an Austrian physician) published a book that proposed the novel concept of classifying skin diseases by their elementary (initial) lesions.[164] In 1808 the English dermatologist Robert Willan refined Plenck's work by providing the first detailed descriptions of several skin disorders using a morphologic terminology that remains in use today.[164] Thomas Bateman continued and expanded on Robert Willan's work as his student and provided the first descriptions and illustrations of acne accepted as accurate by modern dermatologists.[164] Erasmus Wilson, in 1842, was the first to make the distinction between acne vulgaris and rosacea.[165] The first professional medical monograph dedicated entirely to acne was written by Lucius Duncan Bulkley and published in New York in 1885.[166][167]
For UVA protection, a sunscreen with a high UVA protection of PA+++ or higher of PA++++ as recommended, especially to treat PIE. PPD is the UVA equivalent of SPF; use a sunscreen with a minimum of PPD20. The PA+ system has a + that corresponds to a tier of PPD protection. Of note, different countries use different PA systems. Japan and Taiwan changed their PA system to a 4+ tier system while Korea uses a 3+ tier system.
When blocked pores become increasingly irritated or infected, they grow in size and go deeper into the skin. If pimples get trapped beneath the skin’s surface, they can form papules: red, sore spots which can’t be popped (please don’t try! Squeezing the oil, bacteria, and skin cell mixture can result in long term scars that may be unresponsive to acne treatments). They’re formed when the trapped, infected pore becomes increasingly inflamed and irritated, and they usually feel hard to the touch. Papules are small (less than 1 centimeter in diameter) with distinct borders; when clusters of papules occur near each other, they can appear as a rash and make your skin feel rough like sandpaper. Because they’re inaccessible, they’re a bit more difficult to treat, and are therefore considered moderately severe acne.
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How to Handle It: If you've tried the usual anti-acne ingredients, like salicylic acid and benzoyl peroxide (which, we should warn you, rarely work for this), you should consider paying your dermatologist a visit. "You may need a cortisone injection or an oral medication, like an antibiotic, in addition to topical formulas," says Zeichner. He's also a fan of a prescription topical medication called Epiduo Forte Gel, since, he says, it's been shown to be effective at controlling severe acne without the help of oral treatments.
Acne medications work by reducing oil production, speeding up skin cell turnover, fighting bacterial infection or reducing inflammation — which helps prevent scarring. With most prescription acne drugs, you may not see results for four to eight weeks, and your skin may get worse before it gets better. It can take many months or years for your acne to clear up completely.