Help, my child has eczema on their cheek, it's red and bumpy on one side…

Help, my child has eczema on their cheek, it's red and bumpy on one side, and now it's even worse. It's probably my chocolate and sweets. What can I apply to it for two days I have just been applying cream for babies written 0+, but something it didn't help. Can it go away by itself?