I have severe itching on my inner thighs and neck with white patches. the itching is so bad that i can't sleep at night. what is this?

Not clear: Without getting a look at the rash, it is tough to say for sure. Can get over to your primary care doc for a look, but in the meantime can try over the counter Hydrocortisone (anti itch) cream and use a moisturizing lotion after you shore to keep your skin from being too dry. Take care.

Go see your Dr : And get checked for eczema, tinea/ fungal infection etc. Take care and god bless u! http://www.Healthline.Com/health/rashes.