I wasn't sure which forum to post this to but anyways,
At the back of my neck I have always spotted this sort of issue, it smells really foul - as in very sour and when I scratch it brown stuff comes off in my nails. I've been trying to scrub and wash it hard and as much as I can with different types of soaps, cleansers etc but makes no difference.
Secondly, I noticed small blotches on my stomach which expanded and now they show up as rashes. And just since past few days I've noticed spots turned into a rash and a blotch right above. Help? I have also posted a collage of the parts - apologies if you find them unpleasant to see.