I do know what I'm talking about. I have had 4 feet of my large intestine taken out due to a diseased and dead colon from not treating my symptoms earlier in life. Please google search Dr. Group and oxy powder.
Its a fungus, i get it when i sit to long. First, dry your but with some paper towels, then use a an athlete's foot spray or powder. If you using the spray, spray it then use a baby power to keep it dry. The idea is to keep your buttcrack dry all day and the athlete's foot medicine will kill the fungus. I do this when I wake up and then before I go to bed.
Please take a blood test and see if you're low in vitamin D. I have same problem as you since college and those f*****g days are horrible. For the past week I've been taking a daily Vitamin D3 supplement and drank a lot of water. Things have been improving. PLEASE try.
Again, this isn't about not cleaning ourselves good enough, but something that affected us one day and never left. I know many of you have been to doctors and googled a sh*t to of information and still haven't been cured. We are all in this together and I am motivated to find out what is wrong with us and find a cure.