Differential Diagnosis for Sore Throat, Facial Flushing, Itchy Skin, Recurring Cyst, and History of MRSA
- Single Most Likely Diagnosis
- Methicillin-Resistant Staphylococcus aureus (MRSA) Infection: Given the patient's history of MRSA, it is likely that the recurring cyst and sore throat are related to a current or new MRSA infection. The facial flushing and itchy skin could be secondary to the infection or an allergic reaction to the infection.
- Other Likely Diagnoses
- Allergic Reaction: The combination of itchy skin, facial flushing, and sore throat could suggest an allergic reaction, possibly to an antibiotic used to treat MRSA or another allergen.
- Folliculitis or Furunculosis: These are skin infections that can cause recurring cysts and are often caused by Staphylococcus aureus, including MRSA. They can also cause surrounding skin irritation, such as redness and itching.
- Eczema (Atopic Dermatitis): This condition can cause itchy skin and, when severe, can lead to secondary infections, including MRSA. Facial flushing can occur due to scratching or as part of the disease process.
- Do Not Miss Diagnoses
- Toxic Shock Syndrome (TSS): Although less likely, TSS is a life-threatening condition that can be caused by MRSA or other bacterial infections. Symptoms include sudden onset of fever, vomiting, diarrhea, abdominal pain, and rash, which can progress to shock and organ failure. The presence of a sore throat, facial flushing, and itchy skin, especially in the context of a known MRSA history, necessitates consideration of TSS.
- Cellulitis: A bacterial skin infection that can cause redness, swelling, and warmth of the skin, and can be caused by MRSA. It requires prompt treatment to prevent serious complications.
- Rare Diagnoses
- Staphylococcal Scalded Skin Syndrome (SSSS): A rare but serious condition caused by staphylococcal toxins that typically affects infants and young children but can occur in adults, especially those with compromised immune systems. It presents with widespread skin lesions, fever, and irritability.
- Leukocytoclastic Vasculitis: A condition characterized by inflammation of the blood vessels, which can cause skin lesions, itching, and systemic symptoms. It is less common but could be considered in the differential diagnosis if other causes are ruled out.