I don't know what it is or why but my butt crack has been super itchy for the last couple weeks.. I never had this problem before I don't know if it's the body wash I've been using since it has perfume in it but when I'm sleeping it's even itchier then ever. I've been putting Vaseline on it before bed and it helps and go under wear less with baggy pants it makes it feel way better but once I put tight underwear on it itches again so much I put Vaseline it calms it down so much.. Try a lot Vaseline around the area it could be dry skin.. I went to doctor and they said nothing was there and I checked and my skin is so dry. Hopefully by using Vaseline it makes the itch stop it calmed down the itch a lot today I did it last night before bed and went underwear less with baggy pants and so far it feels better as long as I keep Vaseline on it at all times. I hope you guys can try it to and I hope it works for you to!