A little black dot with a cross in the middle how to remove

[Android Central Question]

A little black dot with a cross in the middle has appeared on the bottom of my screen in the middle it's not there when on the lock screen only when I unlock the phone how do I remove it

 

[Javier P]

Welcome to the forums. What phone do you have? What happens if you tap or long press that icon? Can you post a screenshot?