Background: Acne vulgaris varies in clinical severity, from minimal comedonal disease to severe hemorrhagic and ulcerative lesions with scarring. While a family history confers a higher risk for developing acne, the correlation between heritability and clinical severity remains unclear.
Objective: To examine the natural history and heritability of severe acne with scarring in patients undergoing isotretinoin therapy.
Methods: A total of 101 subjects with severe acne with scarring and its variants, including acne conglobata and acne fulminans, were enrolled. All subjects and adult family members underwent an interview regarding their acne, and a corresponding "historical" Investigator's Global Assessment (hIGA) score (0 = clear, 1 = almost clear, 2 = mild, 3 = moderate, 4 = severe, 5 = very severe) was assigned. Study assessors performed an "examination" Investigator's Global Assessment (eIGA) based on the clinical examination of each subject (0 = clear, 1 = almost clear, 2 = mild, 3 = moderate, 4 = severe, 5 = very severe). A detailed family history and pedigree were documented.
Results: Most subjects were Caucasian (44.5%) and male (79.2%) who had previously used doxycycline and/or minocycline (86.1%). The mean eIGA and hIGA scores were 2.7 and 4.4, respectively. 37.2% of subjects had one first-degree relative with a history of moderate or severe acne with scarring; of note, of the patients with hemorrhagic disease, 30% had at least one parent with moderate or severe acne.
Conclusions: Severe forms of acne often "cluster" in families, underscoring the heritable nature of acne and the prognostic value of a family history of moderate or severe disease.
Keywords: acne fulminans; acne vulgaris; family history; genetics; isotretinoin; scarring; severe.
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