What would cause blood to appear in the external auditory canal (EAC) following a deep ear impression?

The presence of blood in the external auditory canal following a deep ear impression can be attributed to the vascular networks located underneath the skin of the external auditory canal. This area contains numerous blood vessels, which could be susceptible to injury during the ear impression process. If the impression is too deep or aggressive, it has the potential to nick or irritate these blood vessels, leading to bleeding.

In contrast, conditions affecting earwax production, excessive cleaning of the ear canal, or the application of ear drops do not directly relate to causing bleeding in this scenario. Disease affecting earwax production does not typically influence vascular integrity in the ear. Excessive cleaning of the ear canal may lead to irritation or damage, but it's less likely to be specifically associated with vascular injury compared to the immediate mechanical impact of performing a deep impression. Lastly, while ear drops might cause irritation, they would not cause bleeding from the vascular networks beneath the skin during the impression process.