Given the central role of digital devices and screens in academic work, their use and our relationship to them are under-theorised in mainstream research into digital education. The COVID-19 pandemic, however, rendered the use of digital screens central to life in 'lockdowns'. This paper will consider the relationships between digital screens and anti-epidemic face masks, considering these artefacts in terms of functionality, academic subjectivities and epistemic practices, drawing on sociomaterial perspectives, Goffman's categories of lecturing "self," and the history of anti-epidemic mask-wearing. I illustrate this with a vignette of teaching via digital screens, given by a member of faculty in an interview study exploring the impact of the lockdown on university staff. It will conclude that the digital screen may be viewed as a 'digital mask'; carrying out a practical function, but also performing an ideology of hygiene and reason. The implications for digital higher education post-pandemic are discussed.