UPDATE: The rash is gone
Thank you again for all the support and suggestions.
Just 3 days after i took that photo the rash went away, and its stayed away for a week now .
I treated it with Neosporin and Triple Paste at each diaper change, with Nystatin 2x a day just in case it was yeast.
But what cured it (i believe) was me cutting soy out of my diet. I've reintroduced dairy in the form of 4oz yogurt/day and it hasn't brought the rash back. Taking out the soy is the only thing i changed diet-wise, and that's when his rash went away. We're still having him tested next week though to see if there's other foods he's sensitive to.
DS (9) DD (6) DS (3) DD (Baby)