The patient’s left lower lung is considered to be infectious lesions, which should be considered to be caused by mycoplasma, viral infection, bacterial infection, etc. It is recommended that the patient find out the cause of the disease and then treat the symptoms. 1. Mycoplasma infection: if the patient is caused by mycoplasma infection, it is recommended to first go to the hospital for mycoplasma antibody and other related examinations, and under the guidance of the doctor to take drugs to relieve the treatment, such as levofloxacin, moxifloxacin, azithromycin and other drugs. 2. Viral infection: If the patient is caused by viral infection, it is recommended to use antiviral drugs, such as acyclovir, ganciclovir, amantadine and other drugs under the guidance of the doctor in the early stage. 3. Bacterial infection: If the patient is caused by bacterial infection, it is recommended to choose appropriate antibiotics for treatment under the guidance of doctors, such as gentamicin, tetracycline, ampicillin and so on. It is recommended that patients should closely observe their own recovery, if there is any discomfort should also immediately consult a physician under the guidance of a clear reason to give targeted treatment, not blindly use their own medication.