Bath Mat No Suction Cups Bath Mat No Suction Cups I Have Marks In My 1922 Clawfoot Tub From The Bath Mat. The Suction Cups Left The Marks Is This Mold?

I have marks in my 1922 clawfoot tub from the bath mat. The suction cups left the marks is this mold? - bath mat no suction cups bath mat no suction cups

Mold is more likely. Suction bath mats have a tendency to do that.