I keep getting this itch around my neck, the more i scratch it burns. nothing i put on it stops the itch. eventually it turns to a rash and black?

Don't scratch.: That may sound like a flippant answer, but the more you scratch, the worse it gets, right? Try over-the-counter Hydrocortisone cream and something with menthol and phenol in it, such as sarna lotion. Take Allegra (fexofenadine) 180mg once a day. If that doesn't work, you'll need to see a dermatologist and get a precise diagnosis, but do whatever you have to do to refrain from scratching.