Rash In Bum Crack

Crack

I have a rash that extends from my anus to the top of my butt crack on both sides that is about a year old. It is quite red in nature, and sometimes will be almost to the point of bleeding in the crack near the top of my butt. It extends out from my crack to about 3/4 inch on each cheek. Earlier in the year, I was diagnosed with some form of psoriais on my penis, and have been alternating the use of Dovonex and Cutivate for that problem. That seems to help to some degree, except when I engage in sex. The physician told me that psoriasis also is possible in the anus area, but did not bring it up to him at that point. The two rashes were visually different, and thought I was irritating it by soap, scented toilet paper, etc. Therefore, I stopped to no avail. I have not been back to him to look at this problem.
I have tried the Dovonex on my crack, and it doesn't seem to help. I also have tried hydrocortisone cream. They will diminish the crack rash slightly, but is not taking care of the problem. I am not sure if we're talking fungus, STD, etc.
1) Can you suggest something I can try for the butt crack rash? Possibly the Cutivate? Or anti-fungal cream?
2) Is there anything better that I can try that allows me to engage in more sex without having to worry about the penis rash erupting? When egaging in sex more than every other day, the head tends to break out in its' rash; and the tiny vessels where the head and shaft meet, borderline on bloodshed.
Thanks.
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The areas of predilection include perineum, bum crack, anus, groin, genital area, and the axillary and submammary folds. Because the mentioned sensitive areas are warm, moist, and vulnerable to friction and damage, they are the “fertile soil” of Candida reproduction.