Amoxicillin good for chiggers?

Chiggers don't : Require antibiotic (until there is a secondary infection). Chigger bites usually heal on their own within one to two weeks. In the meantime, control itching with an over-the-counter anti-itch cream, such as Hydrocortisone cream. Consult your doctor if your skin appears infected or if the bites seem to be spreading to other parts of your body.

WD40: Years ago a faculty member recomended i try wd40 ( a thin petrolium product) for my hunting related bites. It worked so well I have been using it in my practice for decades. It seems to sufficate the buggers but it also has an anti-itch effect.