Thank you for your query.
I can understand your concern. However it is difficult to guide you till the 'pimples' are seen. You are doing the right thing by giving your son Tylenol
to reduce the fever
. As he is having a nasal discharge you can put him on a decongestant/cough
syrup that you may have along with steam inhalation. You can wait for a day or so and in case the 'pimples' do not improve you can consult a doctor.
I hope I have answered your query to your satisfaction.