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I am sorry to hear you are worried about your Shar Pei. It appears Christine is not available; can I be of help? I am a veterinarian and will do my best to help. If you prefer to wait for Christine, I will opt out.
Sometimes this condition does get better on its own, but I saw some cases in my researching your question where it got worse.
Antibiotics won't help, if this is cutaneous mucinosis. In the research I did on Veterinary Information Network, using steroids seems to be the preferred treatment by specialists like dermatologists.
It is recommended to check these dogs for hypothyroidism; sometimes that contributes to this condition, and treating for the hypothryoidism would help.
If there are just a few lesions, you can try gently applying topical cortisone in spray or ointment. I have been searching for an alternative to steroids, but apparently steroids are needed to block the production of the mucin buildup.
I hope you are seeing this! Would you like me to opt out so you can wait for Christine?