There are many potential causes of ear blisters, which are fluid-filled sores that can occur on a person's outer ear or inside his ear. Among the most common causes are infections, which can develop because of viruses or bacteria, and
skin cancer. A person could also develop ear blisters, particularly those on the outer ear, when he has a severe
sunburn. These blisters also sometimes form because of a skin condition such as eczema or
psoriasis. Additionally, a nerve condition called
Ramsey Hunt syndrome is often first diagnosed because of the presence of blisters on or in a person's ears.
When a person develops ear blisters, there is a range of medical conditions that could be causing them. One potential cause is an
ear infection. In some cases, the virus or bacterium that caused the ear infection may also cause blisters in the ear. Individuals who are prone to ear infections and suffer from reoccurring bouts may be more likely to develop blisters, but anyone can develop them.