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I am Dr. Snow, and I can try and help you today with Tigger. It is pretty common to see some redness and irritation when they're having a lot of diarrhea. The first step is keeping her clean and dry back there. I would suggest applying a small amount of apple cider vinegar to the irritated skin, if you have it, and then apply some coconut oil.
The best thing to do would be to get her into your veterinarian soon to get to the bottom of the cause of the diarrhea!
Post back with further questions.