[sballard]

I hate to be the bearer of bad news bro but that looks like the signature of classic rocker panel rot. Mine looked just like that 6 months ago and after I sanded off the paint there was rust in the latch panel, outer and inner rockers, and even the forward part of the quarter panel. It was compounded by one of the POs who no doubt spread copious bondo and repainted to cover it up. I recommend getting an awl or small screwdriver and poke around, and sand down to metal if you find something. Keep in mind that the rust is almost certainly coming from the inside. The jackpost area is notorius for trapping dirt and water and serves as a focal point for rust.