Diaper rash!? Help

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Can anyone help me figure out what this is? He’s had it for weeks already we took him to the pediatrician twice and they only gave him an ointment, they said it should be gone it 10 days and it’s been more than that.

We are now cloth diapering and have been every day for about 4 days

We thought maybe it was the diapers that were irritating his skin

It seems like it’s spreading to his belly