This will kill remaining chiggers. Ask your pharmacist about products that may relieve the itching. Scratching may remove chiggers, but may result in mouthparts remaining at the feeding site. The mouthparts and the scratching can cause secondary infections that may require topical antibiotic treatment. Chiggers found in the United States are not known to transmit any diseases to humans, although some species in Asia and countries in the Pacific do carry a disease called scrub typhus.
Prevention is the best way to avoid chigger bites.
Spray exposed skin with an insect repellent. Read the repellent label carefully before applying to sensitive skin. Pay special attention to spots where chiggers can crawl onto the skin from clothing such as around socks, waistbands, cuffs and collars. Consider spraying clothing that will contact vegetation. Several products are available for application to cloth.