Odd rash on lower abdomen red and itchy flaky hafd for two years?

? Nickel dermatitis. Many possibilities but common is a nickel dermatitis from the button on your jeans. I would apply otc Hydrocortisone 3x daily (rx works better if you go to a dermatologist) and avoid wearing any pants with buttons. If it goes away and you want to wear jeans again, you will need to apply 3 coats of clear nail polish before you wear them every time. Please get checked if not resolved.