Has anyone ever seen this before?  I tested a area with bleach to see if it was mildew and it was not.  I tried honing an area to see if it was topical it was not.  I asked the owner if she had ever used hair dye or any other bath supplies that may have that color in it. Reply was no.  Their contractor suggested that it may be from the floor pan. But as you can see it is on the shower bench in photo #85.  Excuse the color different on the bench photo I used a flash.  And it has a different exposure but is the same color stain as the floor.
picture #85
 
 
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