What is Sanfu patch and how many patches are in a box? Sanfu patch is a traditional Chinese medicine patch made from traditional Chinese medicine. It can be applied to areas such as the neck or back to eliminate uncomfortable symptoms such as moisture and fatigue. A box of Sanfu stickers contains 10 stickers, each sticker is 5x7cm in size. How to use the Sanfu patch correctly. First of all, you should clean it before using the Sanfu patch. Place the patch facing the wound and do not apply it backwards or stretch it. After applying it to the skin, massage it for a few minutes to help the medicine penetrate into the skin faster. The patch on the back of the neck should be changed every 2-3 days, while the patch on the back should be changed every 5-7 days. special need