Differential Diagnosis for Red Raised Itchy Concha
- Single most likely diagnosis
- Allergic contact dermatitis: This is the most likely diagnosis due to the symptoms of redness, raised skin, and itchiness, which are common presentations of an allergic reaction to substances like nickel, fragrances, or preservatives in ear products.
- Other Likely diagnoses
- Eczema (atopic dermatitis): Eczema can cause red, itchy, and raised skin patches, including on the concha, especially in individuals with a history of atopic diseases.
- Psoriasis: Psoriasis can manifest as red, scaly patches on various parts of the body, including the ears, and may cause itching.
- Seborrheic dermatitis: This condition can cause a red, itchy rash on oily areas of the body, including the ears.
- Do Not Miss (ddxs that may not be likely, but would be deadly if missed.)
- Malignant otitis externa: Although rare, this condition is a severe infection of the outer ear and can present with redness and itching. It's more common in diabetic or immunocompromised patients and can be life-threatening if not treated promptly.
- Basal cell carcinoma or squamous cell carcinoma: Skin cancers can present as non-healing lesions or areas of redness and should be considered, especially in sun-exposed areas like the ears.
- Rare diagnoses
- Relapsing polychondritis: An autoimmune disorder that can cause inflammation and damage to cartilaginous structures, including the ears, leading to redness, swelling, and pain.
- Sarcoidosis: A condition that can cause granulomatous inflammation in various parts of the body, including the skin and ears, leading to lesions and other symptoms.