Hi, I Switched Soaps (to Go All Natural) And I

Hi, I switched soaps (to go all natural) and I have been burning (vagina) ever since. I switched back to my old soap, but used the same scrubby in the shower I had for the other soap and now I am burning again. I am looking for relief. I tossed the scrubby. I am guessing there was still old soap on it? It was an all natural oatmeal soap from the farmers market. Seemed it wouldn't be harsh.