One commonly known remedy for chigger bites is to apply nail polish to reduce itchiness. This does not kill the chigger or treat the bite in any way. It simply seals the area off from the air, which keeps the sore from itching so badly. If you want to apply something to relieve itching, it's much better to use a salve or cream that contains antihistamines (Caladryl or hydrocortisone salves are the most common).
Purdue University entomologist Tim Gibb says. "People sometimes resort to strange chigger remedies such as coating their bites with Vaseline or nail polish in an effort to suffocate the chigger. In fact, by the time the bite begins itching, the chigger has long since dropped off. You can't kill something thats not there. The itch is simply our bodies' reaction to the bite."
And then jokingly added:
"If you absolutely must call in sick to work because of chigger bites, tell the boss that you have been diagnosed with arachnid papules," ... "That is going to sound much worse than saying you have a bunch of chigger bites."