Hello - there is a light kink between the edges there - I’d do something like Menno suggests and retrim that edge with a clean new curve. If the edge comes from an intersesction with neighboring surfaces you may want to verify them as well.
BTW, @fabiidesign - I would not model at .1 units tolerance - use at most .01, from the start of the modeling process.
Also, it looks like you may have extended that surface with ExtendSrf > Type=Line. If so, you might want to go back and extend with Type=Smooth, then trim with a clean new curve. I used a line here…
a_PG.3dm (93.5 KB)
-Pascal