The severity of acne vulgaris (Gr. ἀκµή, "point" + L. vulgaris, "common")[24] can be classified as mild, moderate, or severe to determine an appropriate treatment regimen.[20] There is no universally accepted scale for grading acne severity.[15] The presence of clogged skin follicles (known as comedones) limited to the face with occasional inflammatory lesions defines mild acne.[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 appear 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]
Large nodules were previously called cysts. The term nodulocystic has been used in the medical literature to describe severe cases of inflammatory acne.[25] True cysts are rare in those with acne, and the term severe nodular acne is now the preferred terminology.[25]
Acne inversa (L. invertō, "upside-down") and acne rosacea (rosa, "rose-colored" + -āceus, "forming") are not forms of acne and are alternate names that respectively refer to the skin conditions hidradenitis suppurativa (HS) and rosacea.[26][27][28] Although HS shares certain overlapping features with acne vulgaris, such as a tendency to clog skin follicles with skin cell debris, the condition otherwise lacks the hallmark features of acne and is therefore considered a distinct skin disorder.[26]
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