What is the term for the underdeveloped external ear condition present from birth?

The term for an underdeveloped external ear condition present from birth is microtia. Microtia refers specifically to a congenital deformity where the outer ear (pinna) is not fully formed or is abnormally shaped. This condition can range in severity from a small, malformed ear to a complete absence of the external ear. Individuals with microtia may also experience associated hearing loss, particularly if the ear canal is also affected.

Aural atresia, while related, is a different condition where the ear canal is not properly formed, leading to hearing issues as well. Cerumen impaction refers to the build-up of earwax which can cause temporary hearing loss but is not a congenital condition. Otitis externa is an inflammation of the outer ear canal often caused by infection, which is also unrelated to developmental conditions present at birth. Therefore, microtia is the most accurate term for the described condition of an underdeveloped external ear at birth.