The medial bulging of the pharynx is seen in -
Pharyngomaxillary space (Parapharyngeal space or lateral pharyngeal space) is lateral to the pharynx.
Obviously the abscess of this space will produce the bulge medially, i.e. medial bulge of the pharynx.
Pharyngo maxillary abscess
Retropharyngeal abscess
Peritonsillar abscess
Paratonsillar abscess