9. Subject has used topical medications such as corticosteroids, alpha-hydroxyacids greater than 5% (e.g., glycolic acid, lactic acid, etc.), beta-hydroxyacids greater than 2% (e.g., salicylic acid), urea greater than 5%, or topical retinoids (e.g., tazarotene, adapalene, tretinoin) adjacent to or within a 3 cm border around the area to be treated within 28 days prior to entry into the study.