Help! Skin burn!

Last night before bed my boyfriend accidentally touched our 3mo baby with a hot bottle. Once it happened I checked her skin and saw nothing. I woke up to feed and change her around 4am and saw that her skin is burned! It’s like a thumb sized purple burn mark & there is a small blister bubble. I had to leave out of town today to go back to school for the week, I told him to put breastmilk on it for the mean time. What’s the best baby product for skin burns? We feel so bad