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I am sorry to hear about this concern for Bella.
If there is a rash on the face, the likelihood there is a secondary bacteria and/or yeast infection is very high. Therefore, you are going to need a vet to help you. Sometimes, it is very important to get a simple in hospital skin cytology to know what type of infection is present. In addition, quite often, topical therapy is not enough anyway, and oral antibiotics are really important.
It is okay to use topical hydrocortisone and/or topical neosporin, but the vet visit is well worth it especially with the lesion being on the face.
Also, being under a year of age, there is a consideration that this could be mange (mite) related, so either way, worth having a vet evaluate the skin. I would suspect oral antibiotics will be needed.
Hope that information helps
You are very welcome. Hopefully, a speedy recovery for Bella.