History of Present Illness (HPI)

The patient is a 35-year-old woman who presents with swelling on the right side of her face. She reports having a bad tooth on the right upper side, which suggests a possible dental infection. Additionally, she mentions sleeping with a new blanket the previous night and waking up with a rash on the left side of her neck. She also experienced swelling on the right side of her jaw upon waking. The patient's symptoms seem to be related to both a potential allergic reaction (given the new blanket and rash) and a dental issue.

Differential Diagnosis

Single Most Likely Diagnosis

• Dental Abscess or Infection: Given the patient's report of a bad tooth on the right upper side and the swelling on the right side of her face, a dental abscess or infection is the most likely cause. The proximity of the swelling to the reported bad tooth and the nature of the symptoms strongly suggest a dental origin.

Other Likely Diagnoses

• Allergic Contact Dermatitis: The rash on the left side of her neck after using a new blanket could be an allergic reaction to the materials in the blanket. This is a common condition and fits with the patient's history of using a new blanket.
• Peritonsillar Abscess: Although less likely given the specific location of the swelling and the bad tooth, a peritonsillar abscess could cause swelling on one side of the face and is associated with dental issues.

Do Not Miss Diagnoses

• Ludwig's Angina: A severe infection of the tissues in the neck, which can be life-threatening if not promptly treated. It often originates from a dental infection and can cause significant swelling and pain.
• Angioedema: A condition characterized by the rapid swelling of the skin and mucous membranes, which can be life-threatening if it involves the airways. The use of a new blanket could potentially trigger an allergic reaction leading to angioedema.

Rare Diagnoses

• Sarcoidosis: A condition that can cause swelling and rashes, but it is less likely given the acute onset and the specific triggers mentioned (bad tooth and new blanket).
• Erythema Multiforme: A skin condition that can be triggered by infections or medications, characterized by target-like lesions. It's rare and would be less likely without other systemic symptoms or a clear precipitant.