The red, swollen and long blisters in the throat may be caused by herpetic pharyngitis, acute simple pharyngitis and other factors, which need to be analyzed in terms of specific causes. 1. Herpetic pharyngitis: it is an acute upper respiratory tract infection caused by viruses such as coxsackie virus and enterovirus, which is common in children, and can be characterized by fever, sore throat, herpes, redness and swelling of the oral pharyngeal area. 2. Acute simple pharyngitis: acute inflammation of the pharyngeal mucosa and submucosal tissues caused by viral infection, lymphoid follicular hyperplasia occurs, and the clinical manifestation can be pain in the throat, dryness and foreign body sensation, etc., and the local mucous membranes will be congested, edematous and vesicular features. The throat appears red, swollen and long blisters characteristics, should be timely to the hospital, improve the relevant examination, clear cause, under the guidance of the doctor treatment.