What are the different types of acne?Non-inflammatory acne is more mild. It causes whiteheads (closed blocked pores) and blackheads (open blocked pores), but not redness or swelling. Inflammatory acne occurs, as the name implies, when there is some degree of inflammation. It can be further broken down into two categories: mild-to-moderate and moderate-to-severe. What is considered severe acne? Cystic acne is a severe type of inflammatory acne resulting in the formation of often-painful cysts. This type of acne can result in more long-term issues with scarring and post-inflammatory hyperpigmentation. Does it matter what type of acne people have in terms of prognosis or treatment selection? Virtually all cases of acne are treatable. Non-inflammatory acne responds well to over-the-counter treatments and retinoids, which work by preventing the formation of lesions. Retinoids also have some anti-inflammatory properties, so they function well when combined with other medications for inflammatory acne. Mild-to-moderate types of acne also typically respond well to retinoids, as well as to benzoyl peroxide and topical antibiotics. Moderate-to-severe and severe acne cases may require oral antibiotics and other treatments.