Could also be allergies. My pup had this same problem. I'm not sure exactly what it was that got him over it, as I kinda did several things at once, but I'm just happy he's done itching and is comfortable. He was really itchy and would get all flushed and his skin and lips would get really pink. My vet put him on demodex meds as well as allergy meds for a short period, and I also switched his food to one with fewer potential allergens, and the problem has resolved. I started feeding him Innova, which has high quality ingredients and no corn, soy, or wheat, which are all common allergens. He's still young so he's on the puppy formula, but they have adult and senior formulas as well. I'm sure there's other brands that are good in this sense as well, but Innova is the one I chose. Here's a really good site that analyses dog foods and their ingredients:
Dog Food Reviews - Main Index - Powered by ReviewPost
Blue pits commonly have food allergies, so I'd try to eliminate that as a cause early on. Now that my dog's not itching all the time, I have been slowly introducing him to new foods in an attempt to identify what specifically he is allergic to. I give him a new food only every couple of weeks so I can be sure to determine if it's causing a reaction. So far it seems like peanut butter and wheat make him get all flushed and itchy.
Mange is also a good one to eliminate early on, since it's easy to test for and treat.