American pennyroyal is an annual mint with small, oval leaves arranged opposite each other on a square stem. Leaves are entire and may be sparsely-toothed or smooth on the margins. The erect stems grow to one foot high from a many-branched root system. The tiny blue-violet flowers grow in whorls from the leaf axils on the top half of the stems. The fragrant herb blossoms in midsummer. The entire plant exudes a strong, acrid aroma and has a mint flavor. The scent is offensive to fleas, chiggers, mosquitoes, and other irritating insects.
We don't have as much trouble with chiggers as we do with no-see-ums.
Chiggers are very tiny and nearly impossible to see with the naked eye.
No-see-ums are also very tiny but can be seen if you look closely, they are tiny black specks. Their bite can be felt and will itch for quite some time afterwards.
A quick shower or a dip in the creek has been effective at providing relief.
Jewel Weed aka Touch Me Not, can be effective at relieving the itch as well. also effective at relieving the symptoms of poison oak/ivy as well. Simply crush the leaves and stems and rub the juice on the affected area.