Pustules on the child’s gums may be related to bad habits, and may also be caused by periodontitis, calculus and so on. 1. Bad habits: children usually do not pay attention to oral hygiene, often eat irritating food may lead to mucosal damage, so this symptom will appear. 2. Periodontitis: Inflammatory stimulation during periodontitis leads to excessive secretion of inflammatory substances, which causes irritation to the surrounding tissues, leading to tissue damage and secretion aggregation, so the symptom of pustules on the gums will appear. 3. Dental calculus: patients with dental calculus, dental calculus attached to the teeth, may cause irritation to the periodontal tissues, resulting in gum congestion and redness, prolonged stimulation may appear pustules on the gums. Children with pustules on the gums, parents are advised to take their children to the stomatology department of the regular medical institutions in a timely manner, under the guidance of professional doctors to clarify the diagnosis and take targeted measures.