The first photo is an example of what a vasospasm looks like. It’s very easily confused for thrush but goes away after several minutes. The milk pressure can be painful after a feeding and nipple turns white.
Painful nipple twiddling can be avoided with this simple mom hack of giving the child a hands on game device or toy to keep their strong instincts to nipple twiddle to a minimum. My daughter loves this ring catcher water game. Mom win! Saves her brain saves my nipple and builds great eye hand coordination skills! Yay!