I fully understand what you're talking about. I picked up my share of them last Wednesday while out dove hunting. The itching only lasted about 3-4 days.

Nothing I know of really works except waiting them out! By the way, fingernail polish is an old myth. Chiggers don't burrow into the skin. They insert their head like a tick and attach themselves to a hair. Fingernail polish only helps with the itching in that it keeps the air off of it and makes you more aware not to itch it.