EEECK! Gotta be awful ! In all my years and miles, I've never had that issue, thankfully.
Only time I've ever had 'irritation' was when I've used non-cycling bottoms. There have been a few 'social' rides where I had worn some 'normal' hike shorts - of a polyester/nylon twill fabric which had those swimwear type mesh liners. Awful stuff for ridding anything, bike or moto.
Proved to be quite uncomfortable. Now, even when wearing some 'normal' clothes, I'll use either cycling bottoms underneath, or I also have some poly/cotton stretch underwear, which fits like cycling bottoms - those work also.
What have you been wearing consistently, when this developed ???
Much of my cycling bottoms assortment have only chamois material - no padding - so it's not a matter of 'padding' the sitzbones area.- and that includes all those years of using wool bottoms in my early years... I've not ever used chamois cream - although I did try it for a few months, some years back. Proved messy and no real additional pluses for me...
I imagine some people might have more predilection towards this type of issue...
Cracking and Bleeding sounds way beyond just 'prevention' measures - I would not hesitate - RUN to a dermatologist !!!
And try to figure out what caused this in the first palce.
Best of luck! It must be be awful not to be able to jump on the bike and go for a ride...
Ride On
Yuri