Bluish mark on exterior of my caravan

You will need to reduce your photos to below 500k for them to appear. The sites a bit antiquated and can’t handle anything larger. If you’ve an Apple or Android device you can download a resizing App, such as image size from the appropriate store. Very easy to use and free if you don’t mind the adds.

This is what I’m looking at

Have you had the van from new?  Is it possibly a repaired damaged area that is ageing differently to the rest. Just a thought.

No we bought it second hand in 2020,I was thinking it was from a previous repair but was after other peoples view,thanks for your reply