You can take a bath in three days, just be careful not to get water into the fistula when washing. Of course you can wash your hair, but it's more troublesome to be more careful. Because I made it myself, but the washing was particularly troublesome and my head was tired. This is how I survived after incision and drainage in July this year. I go to the hospital to change the drainage strip every day on a hot day, and I must take a shower and wash my hair when I run home on a hot day, so I take a shower every day and wash my hair every other day because I am very careful. Let's talk about treatment first. Look at your photos. The fistula is bulging here, there should be pus in it, and your redness seems to be quite severe. The inflammation should not have completely subsided. If the swelling does not disappear after this time, it is estimated that it will be cut and drained. Even if it is delayed this time and becomes inflamed later, incision and drainage should be made, because only in this way can pus be completely discharged and inflammation be eliminated, which is conducive to surgical resection and radical cure after inflammation, and surgical resection is the only radical cure. Some Chinese medicine ointments should be useless. They can only be said to help reduce inflammation when you are inflamed (not necessarily effective), and treat the symptoms rather than the root cause.