Why are the carrots I am buying at the moment

white_elephant, Jan 22, 7:00pm
getting black marks on them after a few days!

rainrain1, Jan 22, 7:15pm
they do that sometimes, usually the skin of young carrots, but I have no idea why

pickles7, Jan 22, 7:27pm
I have a pic of one, not loaded yet but it is a shocker.