x2!!!!!!!!lol i was thinking more along the lines of rock chips. that looks like it was hit by meteorites. was that bumper repainted at some point? it looks like it wasn't prepped properly and now the paint's peeling off. you'll definitely need to scuff up the surface to give the primer and paint something to adhere to. if it were me, i'd just respray the entire bumper with material that have flexing agents, since bumpers are prone to flexing anyway. touch-up won't look as nice, imo. it's for small areas.