Rash like bites after showering

Do any of you experience rash like bites after showering ? They only appear after I’ve showered it’s like my skin is on fire and then bumps like I’ve been bitten by 100 misquotes appear. At first they would only appear on my arms now they come everywhere. I’m not sure if it’s the soap or not. I’ve tried mild unscented soap and scented soap. An hour later all the bumps are gone and don’t reappear until the next shower.