I have the Toto "Washlet" toilet seat which works like a bidet. The ointments I've tried include Calmoseptine and Zincofax which are similar The calamine in the Calmoseptine has a mild numbing effect. Also various diaper rash creams like Desitin and A+D. My doctor thought she saw fungus in the rash and prescribed Nystatin & Triamcinolone and Halobetasol Propionate Cream. I can't say that any helped, especially as I wipe them off with the first poop.
I've been living with a painful butt since my second bout of Ulcerative Colitis in 2004. Surgery in 2005 didn't help the diaper rash but at it least saved my life. I'm still here 14 years later.