If your child has a dry cough, you should pay attention to two issues: 1) whether your child has a mycoplasma or chlamydia infection. If the child has an allergic cough, or if the child has been exposed to the corresponding allergen, the cough may recur for a long time, and it is necessary to apply anti-allergy medication for nebulized inhalation. At the same time, avoid exposing the child to allergens so that the cough will gradually get better.