Trigeminal Neuralgia: This condition is characterized by sudden, severe, and stabbing pain or numbness and burning sensations in parts of the face. Given the absence of diabetes and trauma, and the localized nature of the symptoms, trigeminal neuralgia is a plausible explanation. It typically affects one side of the face and can be triggered by light touch or even a gentle breeze on the face.

Multiple Sclerosis: Although less common, multiple sclerosis (MS) can present with facial numbness or burning sensations due to demyelination in the central nervous system. The symptoms can be unilateral and may not necessarily follow a typical pattern of MS relapses.
Temporal Arteritis or Giant Cell Arteritis: This condition can cause facial pain and numbness, especially in the jaw area, due to inflammation of the blood vessels. It's more common in older adults and can be associated with other symptoms like jaw claudication and visual disturbances.
Dental Problems: Issues such as an abscess, impacted tooth, or gum disease can cause referred pain or numbness to the face, including the lower right side.

Stroke or Transient Ischemic Attack (TIA): While less likely given the description of burning and numbness without other typical stroke symptoms, it's crucial not to miss a stroke or TIA, as timely intervention is critical. Facial numbness can be a presenting symptom of a stroke, especially if it involves the brainstem or the cerebral cortex.
Lyme Disease: Neurological manifestations of Lyme disease can include facial numbness or paresthesia. Given its potential severity and the importance of early treatment, Lyme disease should be considered, especially in endemic areas.
Sarcoidosis: This systemic disease can affect the nervous system, leading to facial numbness or pain. It's a diagnosis that might not be immediately considered but is important not to miss due to its potential for serious complications.

Neoplastic Lesions: Tumors affecting the trigeminal nerve or its pathways can cause facial numbness or burning sensations. These could be benign, like schwannomas, or malignant.
Vitamin Deficiencies: Certain vitamin deficiencies, such as vitamin B12 deficiency, can cause neurological symptoms including numbness or paresthesia, though these would typically be more generalized.
Sjögren's Syndrome: An autoimmune disorder that can affect the nerves, leading to symptoms like facial numbness, though it's more commonly associated with dry eyes and mouth.