my 13 year old daughter has been using the Boscia purifying cleansing gel, day creme spf 15 and willow bark treatment for her mild acne. After 6 weeks her face remains unchanged, not better, not worse. Her acne is in the t zone and she has some blackheads. What do you recommend? Should she go to a salicylic acid combined with Benzoyl perioxide regimem?