Have a look at the glass and tell me if that looks like a burn on the fog lens?

 

https://goo.gl/photos/TeXLx9v2wcz9kqYHA  

Looks like it to me

Something not right there, back to the dealer!.

Agreed, back to the dealer with that!!

I used the front fogs last week for the first time since we got the car. I was on my way home from work in the early hours and there were a good few thick fog patches on the motorway. They were only on for around 20-25 minutes but I noticed a similar mark to yours on the driver side foglight glass when I was washing the car on Saturday. The passenger side one was fine with no marking at all.

 

 

Have you been back to the dealer yet with yours and if so what did they do? Was the foglight replaced under warranty?

 

 

So this one was a tough one.  I took the car round to a friends to show him and when I got there it had gone.  So i put it down to the trick of the light.  Weird.

Hmmm. Just been and had another look and it is not as noticeable but is still just visible. Only difference is that it was bright and sunny on Saturday and is cloudy and dull today so is it something that is more visible when it's brighter I wonder???

yep I think so

I'm going to keep an eye on ours and see how it goes. I might even pop the front fogs on a couple of times when I'm cleaning the car etc..... to see if it gets worse with another couple of instances of them being used etc.....