This doctor is just a limited company as even this obivous skin rash is simple and common.
It is not the place to ask for diagnosis and treatment of disease on the internet, especially concerning disease in small child.
You never know which is the correct answer and whom is the people(medical knowlege and liability)answering you.
it is no point to save money by doing so,or just the correct diagnosis is delayed and the condition worsen. More suffering of the child is certainly the consequence