Final answer:
Infectious myringitis is a contagious inflammation that causes painful blisters on the eardrum. It is characterized by ear pain, swelling of the eustachian tubes, and other symptoms such as fever and nausea.
Step-by-step explanation:
The term that describes a contagious inflammation that causes painful blisters on the eardrum is infectious myringitis. It is an infection of the middle ear that leads to the formation of pus and fluid buildup, resulting in moderate to severe bulging of the tympanic membrane and ear pain (otalgia). Other symptoms may include swelling of the eustachian tubes, fever, nausea, vomiting, and diarrhea.