Discoloured strap on Galaxy Watch 4

[Zaichik]

I've had my watch a couple of weeks and already the black silicon strap has a discoloured patch on it. The watch has never got wet so I have no idea what has caused the patch. 

Any ideas. (Sorry for the poor image!)

[JoJo03]

I gotcthe hybrid leather grey strap & same has happened.... not impressed at all

[Mallone]

Ask for a replacement because that simply isn't acceptable.