Growing a natural beard makes you just as difficult for others to recognize as wearing a surgical mask.
March 31, 2026
Original Paper
Stimulus Facial Hair Impairs Unfamiliar Face Matching Performance
PsyArXiv · d74j9_v1
The Takeaway
We often treat facial hair as a characteristic of the face itself, but this research found that beards act as significant physical obstructions that impair face-matching accuracy by about 8%. This level of impairment is identical to the effect of wearing a fake beard or a medical mask, making it a major hurdle for security and identity verification.
From the abstract
Many identification tasks require human observers to decide whether the photograph on an identification document matches the person presenting it for inspection. Though this is a common task, average unfamiliar face matching accuracy in laboratory tests is often between 60-90%, even when the photographs are front facing, relatively high quality, and unobstructed. Unnatural obstructions such as reading glasses and surgical face masks further impair the accuracy with which two faces can be matched