- Subjects having received at least one of the following systemic treatments: Corticosteroids, tetracyclines, other antibiotics (except penicillin) (1 month); Oral retinoids/isotretinoin/ anti-androgens / Cyproterone acetate / Chlormadinone acetate (6 months); Spironolactone/ Drospirenone (3 months); Immunomodulators (3 months) and Oral contraceptives/ oral dapsone for acne(1 month).