Itching problem. Or other abnormalities?

Hello Doctor, I have been experiencing persistent itching around my buttocks, especially along the anal/ butt crack, for the past 1-2 weeks. I have also noticed some red rash-like marks around my waist. Similar red marks have appeared on my scrotum, the area beneath the scrotum extending toward the anal region, and on my inner thighs. In addition, I have been noticing a significant unpleasant odor coming from the private area. The itching has become quite uncomfortable and is causing me significant discomfort. Could you please advise me on what this might be and recommend the appropriate medicine or treatment? I have also attached photos of both the front and back private areas for your assessment. I have slightly blurred the penis area in the front image for privacy purposes. Could you please review the images and let me know if you can see any visible rashes, marks, or other abnormalities? Thank you.