Small bubbles inside the baby’s lower lip may be caused by a lack of trace elements or vitamins, or due to infections, such as stomatitis, herpes pharyngitis, it is recommended to consult a doctor promptly to clarify the cause and treat the symptoms. Common causes and treatments 1, lack of trace elements: lack of zinc and vitamin B in children can lead to small herpes, prone to recurring episodes, it is recommended to take zinc gluconate tablets or vitamin B1 as prescribed by the doctor to relieve the symptoms; 2, stomatitis: most of the oral inflammation caused by bacterial and viral infections, resulting in ulcers inside the mouth, which develop into small herpes. Anti-infective treatment, such as metronidazole, can be prescribed; 3. Herpes pharyngitis: mostly caused by coxsackie group A virus or enterovirus 71 infection, the herpes is often distributed in the posterior pharyngeal wall, which is highly contagious and needs to be isolated. Generally take symptomatic treatment, such as accompanied by fever, can take oral ibuprofen, such as sore throat, can use open throat sword spray to relieve symptoms, such as secondary bacterial infection, can follow medical advice to use antibiotic treatment. Note pay attention to a balanced diet, appropriate supplementation of vitamins, zinc, iron and other trace elements, such as vegetables, fruits, yogurt, drink more water, do not eat raw, cold, spicy, stimulating food. Ensure sufficient sleep and appropriate outdoor exercise, such as walking, to enhance physical resistance.