Any Ideas About An Elimination Diet For Breastfeeding My Baby Who Has Eczema?

Hi. My dear 5 month old has bad eczema on the ‘creases’, in the diaper region, the thighs and chest region. I breastfeed exclusively. Has anyone ever tried a diet while breastfeeding that helped eliminate or at least improve the eczema of her child? I have tried to eliminate dairy, but so far not much has changed. Thank you.