How Can A White Patch On The Inner Thigh Be Treated?

I have whitish powder type skin on my left inner thigh right next to my vulva but not on the vulva, it is also slightly red like a paper cut! It is only one small patch and is causing little pain while wearing pants and walking, when I put water also it hurts! It’s is invisible but on closer look it looks like red small vein underneath the skin. I have been using normal shower gel a lot recently and also had my period where I wore pads! I am in London and it is dry weather, and have been wearing tight jeans and jumpers. I don’t know what has caused this and google is showing me scary things