Hi I Am Having A Problem On My Neck. At

Hi i am having a problem on my neck. at first it was just when i woke up but now it has been more frequently that my neck will smell very sour from the way my head rests on my shoulders. i suppose my neck doesnt get any oxygen. i have been overweight my whole life and have lost and gained weight at different times and never experienced this smell before. Right now im at the heaviest weight ive have ever weighed 5'3" 270 but im losing weight and have started running and training again i started just two weeks ago ive lost 5 lbs so far. so im not sure if the odor is from my being overweight and my neck is infected from lack of oxygen or something else because there is also a burning pain which could be loosely compared to a rug burn which could be caused from my rubbing my neck with a wet towel when washing the odor away but i've tried to be gentle to prevent this burn. please help this has been very painful for me ive either had to suffer the stinging/burning pain after washing (after which the odor will return within the next few hours) or suffer the smell (and sometimes the pain as well due to skin friction of turning my head).