If a child has a cold or cough, it is useful to apply herbal patches to the child, which are divided into the main therapeutic effect and the auxiliary therapeutic effect, as follows: 1. If the cough is very severe, such as severe bacterial infection or Mycoplasma pneumoniae infection, in addition to the cold and cough, there will be poor mental state or even high fever, then the herbal patch can only play a supplementary role and needs to be combined with other treatments.