Lymphadenitis: This is an inflammation of the lymph nodes, which could be caused by a bacterial or viral infection. The patient's recent potential tick bite and symptoms of throat pain and neck swelling make this a plausible diagnosis, as the body reacts to the perceived infection.

Pharyngitis: This refers to inflammation of the pharynx, which could be due to a viral or bacterial infection. The throat pain is a common symptom, and the neck swelling could be related to swollen lymph nodes in response to the infection.
Cellulitis: A bacterial skin infection that could have been introduced through the tick bite, leading to swelling and pain in the affected area.
Tick-borne illnesses (e.g., Lyme disease): Although the symptoms described are not specific to Lyme disease (which typically presents with a distinctive rash, fever, headache, and fatigue), it's a consideration given the patient's history of a potential tick bite.

Retropharyngeal abscess: A serious infection that occurs in the tissues in the back of the throat. It's a medical emergency because it can lead to airway obstruction. The symptoms of throat pain and neck swelling could be indicative of this condition, especially if the patient is having difficulty swallowing or breathing.
Epiglottitis: Inflammation of the epiglottis that can lead to airway obstruction. It's less common but critical to diagnose early due to the risk of respiratory failure.
Tuberculosis (TB): Although less common in some regions, TB can cause lymphadenitis and should be considered, especially if the patient has been exposed to someone with TB or has risk factors for TB.

Cat-scratch disease: Caused by the bacterium Bartonella henselae, transmitted through cat scratches or bites. It can lead to lymphadenopathy, which might explain the neck swelling.
Actinomycosis: A rare bacterial infection that can cause abscesses or mass-like lesions in the neck, among other symptoms.
Kawasaki disease: An acute febrile illness that predominantly affects children, characterized by inflammation in the walls of medium-sized arteries throughout the body. It could potentially cause lymphadenopathy and throat pain, although it's much less likely given the context of a tick bite.