Did some digging for a few hours at an outdoor grow, in a location which turned out badly infested with Chiggers. These tiny red mites attach, then burrow a few mm into one's skin by releasing an enzyme which causes *severe* itching and redness. Then they linger inside their burrows and feed for a few days, further prolonging the misery. Chiggers prefer the soft skin close to the genitals, BTW. One or two of them are bad news. That evening whilst applying ointment, I counted 130+ of the little monsters. DEET prevents chiggers from attacking, but I forgot to apply it that day. That was a mistake which I never repeated.