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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Castor oil has anti-inflammatory and antibacterial properties that can speed up healing, making it ideal for breakout-prone skin. Though I recommend using it in very small amounts with jojoba oil, hemp seed oil or coconut oil, along with one of the essential oils above, it’s high in unsaturated fatty acids, vitamin E, proteins and minerals, which can help reduce acne-causing bacteria and inflammation associated with breakouts. It can even help heal scars caused by acne.
The approach to acne treatment underwent significant changes during the twentieth century. Retinoids were introduced as a medical treatment for acne in 1943.[83] Benzoyl peroxide was first proposed as a treatment in 1958 and has been routinely used for this purpose since the 1960s.[168] Acne treatment was modified in the 1950s with the introduction of oral tetracycline antibiotics (such as minocycline). These reinforced the idea amongst dermatologists that bacterial growth on the skin plays an important role in causing acne.[164] Subsequently, in the 1970s tretinoin (original trade name Retin A) was found to be an effective treatment.[169] The development of oral isotretinoin (sold as Accutane and Roaccutane) followed in 1980.[170] After its introduction in the United States it was recognized as a medication highly likely to cause birth defects if taken during pregnancy. In the United States, more than 2,000 women became pregnant while taking isotretinoin between 1982 and 2003, with most pregnancies ending in abortion or miscarriage. About 160 babies were born with birth defects.[171][172]
^ Jump up to: a b GBD 2015 Disease and Injury Incidence and Prevalence, Collaborators. (8 October 2016). "Global, regional, and national incidence, prevalence, and years lived with disability for 310 diseases and injuries, 1990-2015: a systematic analysis for the Global Burden of Disease Study 2015". Lancet. 388 (10053): 1545–1602. doi:10.1016/S0140-6736(16)31678-6. PMC 5055577. PMID 27733282.
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]

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.