DId you recently change soaps or laundry detergent? Did you recently start using fabric softener? Are your jeans tighter than usual and rub on that spot? Have you been to a pool or hot tub recently?
Go to the doctor, especially considering you've had it for a month and it hasn't cleared up. There are any number of things that cause those kinds of reaction in the skin--that's why there's a catch-all diagnosis called "contact dermatitis." They'll hopefully be able to give you a better diagnosis than that if it is something more serious, or refer you to a specialist (dermatologist) if necessary.
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If I am not better, at least I am different. --Jean-Jacques Rousseau
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