I am going to take a wild guess that that is the little protrusion on the back of the wing that contains the flap actuator, and that is just a cover and not structural. Also, I can't really see that there is anything wrong with it but it is hard to tell. Looks like it was photographed from a window above the wing.

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra