Every single aphid in New York State is on my borage plant, I released green lacewing larvae to combat that initially but realized they were just going to hang out of the borage and not touch my weed. This is the wrong shape and color for aphid leaf. The only thing it even closely resembles in my newb mind is the tiniest pieces of shit ever laid by the tiniest bug. The leaf in the picture is less than half a cm wide to give some context there.