My right side of my throat has been red and my tonsil has been swollen for over a month, mild pain, but has no white spots .. ?

Unilateral Tonsiliti: Unilateral tonsillar enlargement may result from infection, chronic inflammatory response, or neoplasm. Neoplasms that commonly produce a unilaterally enlarged tonsil include lymphomas (lymphocytic and histiocytic types) and squamous cell carcinomas. Rarer tumors include extramedullary plasmacytomas, Hodgkin's disease, leukemia, and metastatic neoplasms. You MUST see an ENT specialist