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.
The earliest pathologic change is the formation of a plug (a microcomedone), which is driven primarily by excessive growth, reproduction, and accumulation of skin cells in the hair follicle.[1] In normal skin, the skin cells that have died come up to the surface and exit the pore of the hair follicle.[10] However, increased production of oily sebum in those with acne causes the dead skin cells to stick together.[10] The accumulation of dead skin cell debris and oily sebum blocks the pore of the hair follicle, thus forming the microcomedone.[10] This is further exacerbated by the biofilm created by C. acnes within the hair follicle.[45] If the microcomedone is superficial within the hair follicle, the skin pigment melanin is exposed to air, resulting in its oxidation and dark appearance (known as a blackhead or open comedo).[1][10][20] In contrast, if the microcomedone occurs deep within the hair follicle, this causes the formation of a whitehead (known as a closed comedo).[1][10]
C. acnes also provokes skin inflammation by altering the fatty composition of oily sebum.[45] Oxidation of the lipid squalene by C. acnes is of particular importance. Squalene oxidation activates NF-κB (a protein complex) and consequently increases IL-1α levels.[45] Additionally, squalene oxidation leads to increased activity of the 5-lipoxygenase enzyme responsible for conversion of arachidonic acid to leukotriene B4 (LTB4).[45] LTB4 promotes skin inflammation by acting on the peroxisome proliferator-activated receptor alpha (PPARα) protein.[45] PPARα increases activity of activator protein 1 (AP-1) and NF-κB, thereby leading to the recruitment of inflammatory T cells.[45] The inflammatory properties of C. acnes can be further explained by the bacterium's ability to convert sebum triglycerides to pro-inflammatory free fatty acids via secretion of the enzyme lipase.[45] These free fatty acids spur production of cathelicidin, HBD1, and HBD2, thus leading to further inflammation.[45]

Acne, also known as acne vulgaris, is a long-term skin disease that occurs when hair follicles are clogged with dead skin cells and oil from the skin.[10] It is characterized by blackheads or whiteheads, pimples, oily skin, and possible scarring.[1][2][11] It primarily affects areas of the skin with a relatively high number of oil glands, including the face, upper part of the chest, and back.[12] The resulting appearance can lead to anxiety, reduced self-esteem and, in extreme cases, depression or thoughts of suicide.[3][4]

The costs and social impact of acne are substantial. In the United States, acne vulgaris is responsible for more than 5 million doctor visits and costs over US$2.5 billion each year in direct costs.[13] Similarly, acne vulgaris is responsible for 3.5 million doctor visits each year in the United Kingdom.[20] Sales for the top ten leading acne treatment brands in the US in 2015, have been reported as amounting to $352 million.[176]
It is widely suspected that the anaerobic bacterial species Cutibacterium acnes (formerly Propionibacterium. acnes) contributes to the development of acne, but its exact role is not well understood.[2] There are specific sub-strains of C. acnes associated with normal skin, and moderate or severe inflammatory acne.[50] 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.[30][51] It is unclear whether eradication of the mite improves acne.[51]
In general, it is recommended that people with acne do not wash affected skin more than twice daily.[15] For people with acne and sensitive skin, a fragrance free moisturizer may be used to reduce irritation. Skin irritation from acne medications typically peaks at two weeks after onset of use and tends to improve with continued use.[15] Cosmetic products that specifically say "non-comedogenic", "oil-free", and "won't clog pores" are recommended.[15]
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.”
Sugar: For starters, sugar can use up your valuable acne-fighting minerals, particularly zinc because it’s used to process the sugar you consume. Sugar also causes a spike in blood sugar level, leading to high insulin levels, which creates increased sebum production and blocked pores. Additionally, studies show that sugar also has an inflammatory effect which can worsen existing acne. Steer clear of sweets like cookies and cakes, but don’t worry – chocolate is considered safe for skin.
Ablative lasers deliver an intense wavelength of light to the skin, removing thin outer layers of the skin (epidermis). In addition, collagen production is stimulated in the underlying layer (the dermis). Patients are typically numbed with local anesthetic and the ablation is done as an outpatient procedure. CO2 and erbium are the ablative lasers most often used for acne scar treatment.

A 2013 study on acne vulgaris in The Nurse Practitioner concurred that a multidimensional approach to acne is usually necessary because most people have a combination of symptoms. Based on the advice of dermatologists and aestheticians, we turned our focus to regimen sets, analyzing the ingredients of more than 40 kits before finding our top picks.
Inflammatory Acne: Inflammatory acne is red bumps and pustules, not whiteheads, blackheads and comedones. It doesn't necessarily start as them, either. It arises on its own. Whiteheads, blackheads or comedones that become inflamed can be painful and unsightly. Persistent inflammatory acne may require treatment by a physician or dermatologist, in addition to over-the-counter acne remedies.
Some people swear by the disinfecting power of tea tree oil for acne treatment. It can be applied either full strength or slightly diluted with water directly onto pimples. Use a small amount on a clean cotton swab or cotton pad and dab on the affected areas immediately after cleansing. Because tea tree oil can be drying, you might choose to use both tea tree oil and coconut oil for acne as part of your clear skin regimen.
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.[20] 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]
Acne that’s more inflammatory is denoted as moderate acne. This happens when there are occasional nodules and possibly mild scarring. Severe acne occurs when there are a lot of inflammatory lesions, nodules and possibly scarring. It’s also considered severe if the acne is still present after six months of treatment or if it causes serious psychological issues.
What to know about hormonal imbalances While it is natural to experience hormonal imbalances at certain times in life, such as puberty, menopause, and pregnancy, some hormonal changes are related to underlying medical conditions. This article looks at the causes and symptoms of hormonal imbalances in men and women, as well as treatment and home remedies. Read now
Chemical peels can be used to reduce the appearance of acne scars.[32] Mild peels include those using glycolic acid, lactic acid, salicylic acid, Jessner's solution, or a lower concentrations (20%) of trichloroacetic acid. These peels only affect the epidermal layer of the skin and can be useful in the treatment of superficial acne scars as well as skin pigmentation changes from inflammatory acne.[32] Higher concentrations of trichloroacetic acid (30–40%) are considered to be medium-strength peels and affect skin as deep as the papillary dermis.[32] Formulations of trichloroacetic acid concentrated to 50% or more are considered to be deep chemical peels.[32] Medium-strength and deep-strength chemical peels are more effective for deeper atrophic scars, but are more likely to cause side effects such as skin pigmentation changes, infection, and small white superficial cysts known as milia.[32]

A study conducted by the Department of Dermatology at the University of Freiburg in Germany reports that using frankincense and five other plant extracts for antimicrobial effects on bacteria and yeast relating to the skin proved effective. The study concluded that their antimicrobial effects were powerful enough to be used as a topical treatment of some skin disorders, including acne and eczema. (19) 
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.