I have had flat warts on my legs for ten years. I've used duct tape and apple cider vinegar for two months. It helps but new ones come back. Help?

See a Dermatologist. Flat warts can be a real challenge. First, shaving over warts tends to spread them. Second, topical wart preparations can be cumbersome to apply and are less effective for this type of wart. I would see your pcp or a dermatologist to talk about options. Prescription medications and in-office procedures could solve your problem. Good luck to you.