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Patient 3: (a) pretreatment (chin and neck); (b) pretreatment (chest); (c) pretreatment (back); (d) after 12 weeks treatment with tretinoin lotion and azelaic acid (chin and neck); (e) after 12 weeks treatment with tretinoin lotion and azelaic acid (chest); and (f) after 12 weeks treatment with tretinoin lotion and azelaic acid (back).
