Suggest Remedy For Itchy Rashes/bumps On Body

one month ago, itchy rash started with few bumps on upper back. every couple days new bumps. very itchy if i scratch they look like long cuts. bumps do not go away but some look like healing scabs. worse after shower and working out. bumps seem to appear three at a time but spaced out on my skin in near proximity to each other. have changed laundry soap, shampoo, bed etc