There are many reasons why a yellow blister grows in the throat, such as acute pharyngitis, lymphoid follicular hyperplasia in the throat, and pharyngeal abscess. 1. Acute pharyngitis: Acute pharyngitis is mainly due to bacterial infection, which can show that the mucous membrane of the pharynx is congested, edema, lymphatic tissue hyperplasia, which leads to the pharynx growing a yellow blister. 2. Lymphoid follicular hyperplasia of the pharynx: lymphoid follicular hyperplasia of the pharynx is usually located at the root of the tongue, the position of the posterior wall of the pharynx, which can cause the pharynx to grow a small follicle, and the surface of the pharynx due to drying and crusting to form a yellow vesicle, which can be foreign body in the pharynx, the phenomenon of sore throat. 3. Pharyngeal abscess: the pharyngeal mucous glands are blocked to form mucous cysts, which can be transformed into abscesses, i.e., yellow vesicles, when bacterial infection occurs. There are many reasons why the pharynx grows a yellow vesicle, and it is recommended to go to the hospital in time after the symptoms appear to improve the examination and make a clear diagnosis, as well as take standardized treatment under the guidance of the doctor.