I'm breast feeding and have sore nipples so I started to use nipple shields I now have really itchy nipples and spots around my breasts and on my body?

See md. It could be a skin yeast or bacterial infection or an allergic reaction to the material in the nipple shield. Scabies (a mite) can cause an itchy rash on the nipples and elsewhere (but shouldn't be related to the nipple shield use).