Oh, you're poor baby boy! Isn't it just AWFUL? You simply MUST get their little bottoms clean, but it's the cleaning them that hurts the rash, with all of the rubbing and all. It's a terrible cycle! My daughter got horrible bleeding rashes when she was a baby. To avoid all that rubbing with wipes or a washcloth, I would just rinse her off in the tub with warm water or use the little sprayer thingy in the kitchen sink instead. It seemed less torturous. Then I'd just gently pat her dry with a soft towel. It made for a bit more time & laundry, but it was worth it, just to avoid inflicting all that pain on her.
Next, I'd use pure, plain ol' vitamin E on the rash. (You know, the little capsules with vitamin E oil in them. You just poke it with a pin and squeeze the oil out. (Usually 4 or 5 capsules worth.)
There's also an over the counter remedy that I remember working really well for both healing and prevention. The last I remember, you had to ask the pharmacist for it but you don't need a prescription to get it. I'm pretty sure it's called "Paladin" but I'm not positive about the name. (My "baby" is now 18 years old... it's been a while!)
I'm a bit confused by your post. You say you son is on Kaiser insurance? Or CHP+? Is it a Kaiser doc that you don't want to go back to? Why is it you don't want to take him to the same doctor? Was it a Kaiser doctor?
I live in Longmont, and am on Kaiser also, and therefore also go to the Longmont clinic. The GP we see there is Dr. Pamela Wanner, and she is simply wonderful. When she's not available, we see Dr. Zegob, (also a woman) who is also out of this world. Generally speaking, I really don't like Kaiser all that much. But I've gotta say, these 2 doc's are pretty darn good. You might want to give them a try, maybe?
I hope your son heals quickly!