Myringitis bullosa is caused by –
**Core Concept**
Myringitis bullosa is a rare condition characterized by the formation of bullae (blisters) on the tympanic membrane (eardrum) due to trauma or infection. The condition is often associated with viral infections, but can also be caused by bacterial or fungal pathogens.
**Why the Correct Answer is Right**
Myringitis bullosa is typically caused by viral infections, particularly those caused by the coxsackie virus or the herpes simplex virus. These viruses can lead to the formation of bullae on the tympanic membrane due to the damage to the epithelial cells and the subsequent inflammatory response. The viral infection can cause the formation of microvesicles and subsequent bullae, leading to the characteristic symptoms of myringitis bullosa.
**Why Each Wrong Option is Incorrect**
* **Option A:** While bacterial infections can cause myringitis, they are not typically associated with the formation of bullae characteristic of myringitis bullosa.
* **Option B:** Fungal infections are rare causes of myringitis and are not typically associated with the formation of bullae.
* **Option C:** Chemical trauma is a possible cause of myringitis, but it is not typically associated with the formation of bullae characteristic of myringitis bullosa.
**Clinical Pearl / High-Yield Fact**
Myringitis bullosa can be a complication of viral infections, and it is essential to consider this diagnosis in patients presenting with symptoms of ear pain and fever. A thorough examination of the tympanic membrane is necessary to diagnose myringitis bullosa, and it is crucial to differentiate it from other conditions that may present with similar symptoms.
**Correct Answer:** D.