YES, I have used 20% also. #1 - Eva Naturals Azelaic Acid 10% Facial Serum which I dab on spots throughout the day(Amazon), #2 - Ecological Formulas EFM-MZMX2 Melazepam Emollient Cream for Acne and Rosacea 20% (Amazon with pics and questions) - large tubes, as a woman, it is not as compatible with cosmetic stuff since it pills but it does soak in and work, #3 - The Ordinary Azelaic Acid Suspension 10% (Sephora and The Abnormal Beauty Co) is the first one I used is a really nice soft matte finish, #4 - Azelex $20 + ship from overseas is what I asked my MD and she confirmed and I purchased from https://trustedrxsolutions.com/buy-azelex-usa.html without issues, #5 - Finecea (10%) I found online at a pharmacy that required a prescription but they took my personal info and created a prescription for me then sent the medication. I have all of these because when I find something that works, I buy it all and rotate. None of it has been expensive at all compared to my distress and peace of mind. I hope this helps