i had a really bad rash on my right arm. it's cleared up now but the rash lasted i swear to god 8 months. I don't remember what i was reading up on but i had tiny little marks that looked like i stabbed myself a hundred times with a needle. I did a google search for flea's or blood sucking insects and i don't really remember what i which insect i was reading up on but it mentioned something about a tiny bug can burrow inside of you and live for a few days, when it dies that's when the rash comes because our bodies are naturally allergic to these things because their dirty/dusty bodies. There was no real remedy for it just lots of cortizone or any anti itch cream due to the fact that our bodies will detoxify itself if a unknown object enters our bodies and will eventually spit it out!?!?!? you said chiggars don't dig inside our skin so i have no idea what it could be? the only thing i know that digs in us is a tick but you'd get lime disease in some cases.
My rash SUCKED so bad though i tried everything to make the itch go away and nothing really helped that much. Someone told me about the nail polish remover and they said vinagar works too. I even tried that blue star ointment that says it's for jock itch hahaha it honestly made the itch worse. The entire time my arm felt like sand paper from the rash and itching it every 5 seconds. I did buy this nextcare stuff for skin cracks after it started clearing up and now i have a girl arm where it's smooth.