Children with small bumps on the inside of the lower lip are considered to be sebaceous gland ectasia, oral ulcers, sublingual gland cysts and other diseases, parents can take their children to the doctor to take medication and surgical treatment. 1. Sebaceous ectasia: this disease often appears in the patient cavity mucosa and other locations of the spherical or flat pimples, resulting in children appearing inside the lower lip pimples. The disease itself is self-limiting, most children in adulthood will naturally subside, clinical believe that isotretinoin may promote the recovery of this disease. 2. Mouth ulcers: this disease often leads to children’s lips, gums and other mucous membranes appear round ulcer surface, usually accompanied by redness and swelling around the symptom, thus manifested as children’s lower lip inside the small bumps. Watermelon cream can be used to apply locally, can also be given recombinant human epidermal growth factor and other drugs to promote wound healing as prescribed by the doctor. 3. Sublingual gland cysts: cysts are often found in the sublingual and submandibular regions of patients with this disease, and some children may have small bumps on the inside of their lower lips. It can be treated by surgery such as sublingual gland removal. There are many clinical reasons for children to have bumps on their lower lips, so parents are advised to take their children to the doctor for examination and treatment after clarifying the specific causes.