Hi,soif your still having the issue after you reset then you should replace the screen but watch out the Ear piece center and proximity and Face ID sensor are delicate but while your in there I would recommend you check the water proofing indicator to see if the device has been in water you will know if the color of the sticker is red not white.I will put a link to the guide to replace the screen and a picture of the water indicator.
Guide:[guide|113862]
water indicator link: https://support.apple.com/en-us/HT204104