Cut on my taint

Alice

So I had really rough sex like 2 months ago and it made a cut that goes up my taint. It keeps re opening since there is always moisture down there and it opens when I wipe and I don’t know how to get it to heal and stay healed. Anyone else ever go through this? I went to the OB and there is no infection it’s not deep and just needs to heal on it’s own but it’s in such a moist place I don’t know how to get it to heal.