The correct term for the lower incisors is mandibular incisors, and the presence of a pressed and distended pocket between the mandibular incisors may be a periodontal abscess or acute suppurative periapical inflammation, as follows. 1. Periodontal abscess: If periodontal inflammation occurs in the mandibular incisor area, periodontal abscess will appear when the periodontitis progresses to the advanced stage, and the pus is confined to the wall of the periodontal pockets, which will produce pressure and swelling pain. 2. Acute purulent periapical inflammation: If the mandibular incisors are in the purulent stage of acute periapical inflammation and the pus is confined to the submucosa, the mucosa of the apical area may be hemispherical and bulge, and there is distension and pain when pressed. There may be other reasons for the swelling and pain when pressed between the mandibular incisors, it is recommended to go to the hospital in a timely manner, to clarify the cause of the disease and then targeted treatment.