- Has used topical medications: corticosteroids, alpha hydroxy acids (e.g., glycolic acid, lactic acid, etc. >5%), beta hydroxy acid (salicylic acid >2%), urea >2%, 5-fluorouracil, diclofenac, imiquimod, ingenol mebutate, aminolevulinic acid (ALA) or prescription retinoids (e.g., tazarotene, adapalene, tretinoin), over-the-counter (OTC) products labeled as scrubs of any kind which are used to smooth the skin (as they contain some form of exfoliant such as nut shells, coffee grounds, polymer particles, etc.) within the selected treatment area (face or bald scalp) within one month prior to the Baseline Visit.