Gums are purple may be gingivitis, periodontitis, apical periodontitis and other diseases. 1. Gingivitis: gingivitis may be caused by localized plaque, tooth misalignment and crowding, mouth breathing and other factors. Patients will appear gum color is dark red, and accompanied by gum pain, itching and other discomfort symptoms, manifested in the gums is purple. 2. Periodontitis: Periodontitis can be caused by plaque, trauma, food impaction and other factors. The patient will have red and swollen gums, periodontal abscess and other symptoms, manifested by the gums are purple. 3. Periapical inflammation: Periapical inflammation may be caused by bacterial infection, physical irritation and other factors. The patient’s symptoms are swollen and painful gums, and some patients’ gums become darker in color, which may appear as purple. There are many reasons for the purple color of the gums, and it is recommended that patients go to the hospital to find out the cause of the disease. Once the diagnosis is confirmed, you need to actively cooperate with the doctor to take treatment measures.