Obesia geminata

Obesia geminata, also known as the mealybug, is a small, soft-bodied insect that infests various plant species, including the Obesia geminata plant itself.

However, there is no information on a plant called "Obesia geminata" with known medicinal properties.

It's possible you are referring to the Obesia erysimi, which is a species of aphid-like insect that infests the cabbage plant.