If these are indeed red bugs, chiggers, then they are repelled by flowers of sulfur. Here in the south they are devils to me personally, they get on me from grass and plants in the woods, crawl to warm spots on my body such as backs of knees, waist line, etc. They burrow into your skin and the females lay eggs....now mine you these are so small you can hardly see them without a magnifying glass. Welts show up the next day or later and itch terribly. If you already have them under your skin then fingernail polish or a product called Chiggerid works well....smothers the chigger.
I have found that my best preventative measure is to take a sock, empty a container of flowers of sulfur (grocery stores and drug stores in pharmacy dept) into the sock, tie a knot in the end, keep the sock in a plastic bag and when I go out then I dust around my ankles, lower pants legs, forearms, backs of knees with the sock. Repels great, but wash your work clothes separately as it will leave a slight sulfur smell on the clothes. I have also used the sulfur on my chickens too....put it in a plastic kitchen salt shaker with handle on side so easy to dispense.
Good luck with the chiggers, Leslie