I got 150 chigger bites at once back in the day, and itched uncontrollably for about a week and a half. The "cure" that worked best was sitting in the hottest water I could stand in the bathtub, it would provide relief for about a half hour. Antihistamines and all that stuff did nothing. Then someone told me to paint each bite with women's fingernail polish, after a half hour of doing that they all suffocated and my ordeal was over.