Differential Diagnosis for 63 y/o Male with Swollen Ear Canal, Rash on Face, and Red Conjunctiva
- Single Most Likely Diagnosis
- Cellulitis: Given the combination of a swollen ear canal, rash on the face, and red conjunctiva, cellulitis is a strong consideration. Cellulitis is a common bacterial skin infection that can cause redness, swelling, and warmth of the skin, which could explain the patient's symptoms.
- Other Likely Diagnoses
- Eczema/Dermatitis: The rash on the face could be indicative of eczema or dermatitis, which can also cause redness and swelling. The involvement of the ear canal and conjunctiva might suggest an allergic or irritant contact dermatitis.
- Impetigo: A highly contagious bacterial skin infection that can cause red sores on the face, which could potentially spread to the ear canal and cause swelling.
- Allergic Reaction: An allergic reaction to something like makeup, soap, or an insect bite could cause a rash on the face, swelling of the ear canal, and red conjunctiva.
- Do Not Miss Diagnoses
- Lyme Disease: Although less common, Lyme disease can cause a distinctive rash (erythema migrans) and can affect the eyes (causing conjunctivitis) and potentially the ears. Given its potential for serious complications if untreated, it's crucial not to miss this diagnosis.
- Herpes Zoster (Shingles): Shingles can cause a painful rash that might involve the face, including the ear canal, and can lead to serious complications like herpes zoster ophthalmicus if the eye is involved.
- Meningitis: In rare cases, symptoms like a rash and red conjunctiva could be associated with meningitis, especially if caused by Neisseria meningitidis (meningococcal meningitis), which can present with a petechial or purpuric rash.
- Rare Diagnoses
- Relapsing Polychondritis: A rare autoimmune disorder that can cause cartilage inflammation, leading to symptoms like a swollen ear canal, among other systemic symptoms.
- Granulomatosis with Polyangiitis (GPA): Formerly known as Wegener's granulomatosis, GPA is a rare autoimmune disorder that can affect various parts of the body, including the eyes, ears, and skin, causing a wide range of symptoms including rash, conjunctivitis, and ear canal swelling.