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Sometimes strange 'worm' and 'dust cloud' starts to follow my finger when browsing with my Huawei Honor 7.

When the finger is not touching the screen anymore, the line disappears.

I can also draw over the navigation buttons at the bottom of the screen.

What is going on here?

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It is Huawei's Knuckle Gestures.

From Use Your Phone with Your Knuckles,

Knock the screen with a knuckle and hold it until a blue dot appears. You can then drag your knuckle [...]. As you move your knuckle, a blue line will appear on the screen [...].

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