Meant to add, and I don't see this mentioned often, but do a search for the Shar Pei Club of America. Often the breed clubs have lots of information and links on their sites in regards to breed specific issues.
Oh, that's too bad. Hate to say it but my Vet once said Shar Peis can be some Vet's dream come true. They can be plagued with skin and eye problems. I'd maybe try the Pro Plan Salmon Food for Sensitive stomachs. Get a small bad and mix it with the present food for a couple of days, never switch diets suddenly. Due to the folds in the skin, they can get damp and irritated. I would bath her in maybe an oatmeal shampoo and make sure she is dry and inside the ears also. Not sure what she sleeps on but I'd try to limit it to cotton bedding. If it looks ***** or red, a trip to the Vet and getting a skin scraping and some blood work done may be in order. Good luck!! Skin problems can be so hard to deal with and figure out the cause.
Change your dogs diet. Standard store bought dog food is extremely allergenic and has little quality nutrition. Get an organic brand with no corn, wheat or soy. You can use alo vera gel on the hot spots. Other things to try are dabbing the affected area with green tea or MSM liquid drops. Also give your dog a couple standard fish oil capsules. Avoid any vaccinations until the problems clear. Also avoid chemically based flea and tick products!! Never use them... You can purchase completely natural flea and tick products that are based in essential oils. Get a natural shampoo that has no coloring, dyes or lauryl sulfates. Oh yeah, I almost forgot one of the best things! Coconut oil! Organic coconut oil applied directly and a table spoon orally. Dogs love coconut oil.
I had a Shar pei mix once. She was a great dog! A little stubborn tho, but I loved her so much! The breed tends to have skin issues so make the necessary adjustments and you and your pet will be fine. Give the dog lots of love. She's not infectious so don't avoid her. Love heals!!