Screen fault? Had the S3 Frontier around three months. Reasonably light usage but just noticed this dark spot to the lower of the screen. I used a white image via the gallery
Amazon.com: [2+1 Pack] Compatible Samsung Galaxy Watch 46mm/ Gear S3 Case Cover with Screen Protector, Soft TPU Plated Protective Bumper Shell + Tempered Glass Screen Protector film for Gear S3 Frontier/Classic :
Samsung Galaxy Watch3 (45mm) Screen and Frame
Original Lcd For Samsung Gear S3 Smart Watch Screen For Samsung Gear S3 Sm-r760 Lcd Display Touch Screen Sm-r765 Lcd - Mobile Phone Lcd Screens - AliExpress