My 28 yr old daughter has several medical issues and 1 is constipation issues from her medications. She takes miralax everyday and still has issues. About a week ago she had bad diarhea and hasn't pooped since the diarrhea stopped. Today she is complaining about stinging/burning on her butt area. the area around her anus looks much darker than I have ever noticed before for her and am wondering if this is a problem? She is not sexually active due to disability issues.