Viral Upper Respiratory Tract Infection (URTI): Given the symptoms of being snotty, intermittent sore throat, and a brief period of fever, a viral URTI is the most likely diagnosis. The complaint of pain inside the cheek and ear could be referred pain from the throat or indicative of a secondary ear infection, which is common in children with URTIs.

Streptococcal Pharyngitis: Although less common than viral causes, streptococcal pharyngitis (strep throat) could explain the sore throat and fever. The absence of a prolonged fever and the presence of snottiness might lean more towards a viral etiology, but strep throat should be considered, especially if the sore throat persists or worsens.
Otitis Media: The complaint of ear pain could indicate otitis media (middle ear infection), which is a common complication of URTIs in children. The ear pain could be the primary concern, with the throat symptoms being secondary or part of the overall viral syndrome.
Sinusitis: Given the age of the child and the symptoms of being snotty, sinusitis could be a consideration, especially if the symptoms persist beyond the typical duration of a viral URTI.

Retropharyngeal Abscess: Although rare, a retropharyngeal abscess is a serious condition that requires prompt diagnosis and treatment. Symptoms can include sore throat, difficulty swallowing, and neck stiffness, which might not all be present in this case but should be considered given the severity of the potential condition.
Peritonsillar Abscess: This condition, characterized by a collection of pus behind the tonsils, can cause severe throat pain, difficulty swallowing, and fever. It's a complication of tonsillitis and requires urgent medical attention.
Epiglottitis: This is a rare but life-threatening condition that causes inflammation of the epiglottis, which can lead to airway obstruction. Symptoms include severe sore throat, difficulty swallowing, and shortness of breath. Although the presentation might not perfectly match, the potential severity warrants consideration.

Lemierre's Syndrome: A rare condition characterized by a bacterial infection of the throat, followed by the spread of the infection to the jugular vein, leading to thrombophlebitis. It's more common in adolescents and young adults but could be considered in any case of severe or prolonged throat infection.
Tuberculosis (TB): Although rare in many parts of the world, TB can cause chronic symptoms including cough, fever, and weight loss. In some cases, it can present with localized symptoms such as a sore throat or ear pain if there is lymph node involvement.
Immunodeficiency: Recurrent or severe infections could indicate an underlying immunodeficiency. While this would be an uncommon diagnosis, it's essential to consider in children with frequent, severe, or unusual infections.