In allergic pharyngitis, granularity in posterior pharynx is due to
Pharyngeal signs include granular pharyngitis due to hyperplasia of submucosal lymphoid tissue. A child with perennial allergic rhinitis may show all the features of prolonged mouth breathing as seen in adenoid hyperplasia. Ref: Dhingra 7e pg 188.
Hyperplasia of mucous membrane
Hyperplasia of sebaceous glands
Hyperplasia of submucosal lymphoid tissue
Inspissated mucous
Nose and paranasal sinuses