Found it on asiatic lily there are hundreds of them
Your little yellow insect is the purple-spotted lily aphid. They are not a native insect, but were brought into this country in the late 1800’s and are now a pest on cultivated lilies.
Most aphids are wingless, however if they become overcrowded on a plant, winged aphids are produced to migrate to other lilies. With this insect, females do not lay eggs, but give birth to live young without mating. In the fall, males are produced that then mate with females to produce eggs that overwinter. This life cycle does occur in most aphid species.
This aphid is found in eastern North America.
Aphids can build to large populations quickly. If they build to high numbers that are damaging your lilies, try knocking them off the plant with a forceful stream of water. Usually they are eaten by predators before they get back on the plant in any number. If that is not enough then spray with Insecticidal soap following label directions.
This insect will not bite or sting.