dry, itchy, slow healing sores on lower legs

I have several small, dry, itchy, slow healing sores on my lower legs. It feels good to scratch them, like poison oak sores do. It also feels good to spray very hot water on them, also like poison oak sores do. There is no pus, only some light scabbing that bleeds profusely when scratched off. Moisturizing lotion seems to make the itching worse. In the shower I always clean with soap. All other cuts, bruises, etc. on my body heal just fine and quickly. I realize that scratching impedes the healing process, but I try not to scratch, and feel they should have healed by now regardless. One of the sores, the first, is about 2" in diameter, and I've had it for 6 months or more. And as a side note, dogs are very interested in this one sore in particular. I always wear shorts, and every dog I encounter has to sniff and sniff that sore.