My daughter had a reaction like this when she had an allergic reaction to dairy and pineapple. I didn’t put a diaper on her for like 2 days during the day and when I did, I used cornstarch baby powder to keep the area dry. I also changed her constantly and used lots of diaper cream. I took her to the doctor for it because it scared me so bad. Hers wasn’t yeast, but they did give me some diaper cream and it really helped. You might want to go to the doctor.

Put Neosporin

You should take her to urgent care. That looks pretty bad and she's probably in a lot of pain. Let her go naked and dry out before putting anything on it. Desitin never worked for my kids. We use a&d. They have very sensitive skin and had to be changed as soon as they went. Make sure she is as dry as possible. Urgent care should be able to give you something stronger to clear it up.

Take her to the doctor or urgent care or er they will give you something stronger then regular diaper cream

that looks bad. make sure you are changing her very often and let it air dry. use wipes that are fragrance free also, if it's still bad tomorrow go to the Emergency or walk in clinic

That looks like yeast to me.

It's best to air it out

The butt paste and desitin never worked for my girls, usually only made it worse, we started using a&d that helped clear it up for us. Also could be yeast, so have her seen as soon as you can and they can prescribe something if it is.

Ok

Leave nappy off for a while for it to dry (put a towel down) then smother in Vaseline xx

I’d take her to be seen that’s really bad

Make an appointment with baby's doctor. It could be a reaction to something that's causing it. Looks like it hurts.

Butt paste and keep it a dry as possible maybe try to leave the diaper off for a bit so it can get some air

Try giving her some nappy off time. It looks like the edges of her nappy and clothes have got wet and irritated her. Lots of cream on when you do put a nappy on and change her lots.

Ouch! Boudreaux butt paste. Let the area dry before applying. Give her some air time if you can.

She needs some. Diaper. Cream all. Over