Looks like a defect in the powder coating. Your exhaust pipe also looks fairly rusted (compared to mine), is the bike stored outside? Do you ride in the rain a lot? I'm just curious as to why some Scramblers seem to be corroding worse than others.
13000 miles (21000 km 'ish) around southern England in less than a year would suggest a certain amount of rain riding.....
I store it in a garage but had to commute all through last winter (120 mile round trip) so theres no avoiding the wet.
I agree just a fault in powder coating. We shall see.
At present, I am scrubbing it clean and picking up quite a few areas that have gone unnoticed and turning orange. Probably time to strip it down,clean and coat with something. What are you guys using to protect non-heat metalwork?
...also, debating with a neighbour (owns a '98 M900, immaculate) about chain lubes. What is the best/preferred... wax or oil etc. What are you lot using?
Good luck. My spokes, termi muffler, handle bars and oil cooler nipples were rusting. Dealer took a bunch of photos, sent them to Ducati, Ducati told them to kick rocks. Said it was, "environmental" and to clean it up with a scotch brite and coat in WD-40. My bike only had 600 miles at the time, garage kept, never saw rain, always wiped down with honda polish after each ride. Honestly, the dealer was very professional, Ducati I'm not impressed with. Don't know if I'd consider buying another one. I've owned and raced 20+ bikes in my life and never had a bike rust like this.