Differential Diagnoses for Unilateral Painful Tonsil Stone with White Spots

Primary Differential Diagnoses

The American Academy of Pediatrics and the Infectious Diseases Society of America recommend that even without systemic symptoms, Group A Streptococcal (GAS) pharyngitis must be excluded because it can present with unilateral tonsillar exudates and requires antibiotic treatment to prevent complications 1, 2
The Centers for Disease Control and Prevention (CDC) and the American Heart Association (AHA) suggest that white spots could represent streptococcal exudates rather than a tonsillolith, and clinical diagnosis alone is unreliable—you must perform either a rapid antigen detection test (RADT) or throat culture to confirm or exclude GAS 1, 2
The Infectious Diseases Society of America recommends that the absence of fever does not rule out GAS, as not all patients report fever, and key distinguishing features favoring GAS include: tonsillopharyngeal erythema, tender anterior cervical lymphadenopathy, absence of cough/rhinorrhea/hoarseness 1, 2, 3
The American Academy of Otolaryngology-Head and Neck Surgery suggests that unilateral tonsillar pathology, especially in adults >40 years with tobacco/alcohol use, requires exclusion of squamous cell carcinoma 4
The American College of Physicians recommends that any unilateral tonsillar abnormality that persists beyond 2-3 weeks warrants ENT referral for biopsy 4

The American Academy of Family Physicians and the American College of Physicians recommend performing RADT or throat culture immediately to exclude GAS pharyngitis, and if positive, treat with penicillin regardless of symptom severity to prevent complications 1, 2
The Infectious Diseases Society of America suggests that if GAS is excluded, expectant management, manual removal if accessible, or consider tonsillectomy only if recurrent and symptomatic may be appropriate 1, 2

The American Medical Association and the American Academy of Pediatrics recommend not failing to perform microbiological testing (RADT or culture) and relying on clinical diagnosis alone for pharyngitis, as this can lead to misdiagnosis and inappropriate treatment 1, 2
The Centers for Disease Control and Prevention (CDC) warn against assuming absence of fever excludes bacterial infection—GAS pharyngitis can occur without fever, and missing early peritonsillar abscess by not examining for asymmetry, uvular deviation, or trismus can have serious consequences 1, 2, 3

The American Academy of Otolaryngology-Head and Neck Surgery recommends that any unilateral tonsillar abnormality persisting >2-3 weeks, suspected peritonsillar abscess or inability to exclude it clinically, or patient meets Paradise criteria for recurrent tonsillitis should be referred to ENT 2, 4