Yup, that's absolutely correct. Moisture builds up and it can really aggravate hot spots. If you don't want to switch foods, the least you can do is to help aerate the inflamed area by swabbing down the spot with a cotton ball once or more a day. When the hot spot clears down, you can opt to clip/thin down the hair on the irritated areas to improve aeration. Other than that, you've received fabulous advice and I hope your dog gets better.