Dermatologists aren’t sure why azelaic acid is so effective at clearing up inflammation, but it’s often used as an option for sensitive skin or pregnant patients. Linkner says the ingredient is good at treating malasma, acne, and rosacea. Your dermatologist can prescribe a foam product with azelaic acid, and you can also find beauty products with very small amounts of this active ingredient.
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.
The severity of acne vulgaris (Gr. ἀκµή, "point" + L. vulgaris, "common")[24] can be classified as mild, moderate, or severe as this helps to determine an appropriate treatment regimen.[20] There is no universally accepted scale for grading acne severity.[15] Mild acne is classically defined by the presence of clogged skin follicles (known as comedones) limited to the face with occasional inflammatory lesions.[20] Moderate severity acne is said to occur when a higher number of inflammatory papules and pustules occur on the face compared to mild cases of acne and are found on the trunk of the body.[20] Severe acne is said to occur when nodules (the painful 'bumps' lying under the skin) are the characteristic facial lesions and involvement of the trunk is extensive.[20][25]
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) 
Scarring from severe cystic acne can have harmful effects on a person's self esteem, happiness and mental health. Thankfully, there are many different acne scar treatment options available, ranging from chemical peels and skin fillers to dermabrasion and laser resurfacing. According to the American Academy of Dermatology, these are all safe and effective acne scar treatment methods. However, Baldwin says it's important to first clarify what you mean by "scar." "Many people point to red or brown spots leftover from old zits and call them scars," she says. "These are marks, not scars and they'll fade with time. Scars have textural changes and are not flush with the surface of the skin. There are two types of acne scars—innies and outies. Outies can be injected with corticosteroids and flattened. Innies can be either deep and narrow or broad, sloping and relatively shallow. Deep and narrow scars need to be cut out, but broader sloping scars can be made better by fillers, laser resurfacing and dermabrasion."
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.
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