Not sure if this is mildew or what - black marks on tile

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Old 01-21-21, 11:48 AM
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Not sure if this is mildew or what - black marks on tile

Hey all so these black circles have appeared in my master shower, along with scratches. Very odd. Not sure if this is possibly water behind the tile seeping thru. Before I get too far along just trying to get an idea from folks that know more than me. Any help is appreciate on what this is and how to best treat it. Thanks






 
 

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