For one, eczema can cause red, sore skin that’s incessantly itchy and painful in your genital area. Similarly, lichen sclerosus causes severely itchy and painful white and shiny skin down there that may even lead to tearing and scarring if left untreated.
Read more here https://www.prevention.com/health/a32650842/why-does-it-hurt-when-i-pee/