The Xiaomi 15's proximity sensor is integrated under the screen, and when making calls or using voice features in third-party apps, it operates through the display. This can lead to the appearance of four bright spots flashing in the lower right corner of the front camera. This is a normal phenomenon and not a product quality issue.
The flashing spots occur because the sensor is detecting the proximity of your face or other objects. The spots are more noticeable when using light-colored wallpapers, as the bright contrast makes them stand out. However, once the call or voice application is closed, the flashing spots will disappear, so there is no need for concern. If the appearance of these spots feels distracting, you can try switching to a darker wallpaper or simply ignore them, as they do not affect the phone’s performance or functionality.