WOW, HAD A STAIN ON THE ARM PIT OF MY

WOW, HAD A STAIN ON THE ARM PIT OF MY POLO SHIRT, SPRAY HOUSE HOLD "BLEACH" ON IT, THEN RINSE OUT WITH WARM WATER AND SOAP. PAT DRY WITH TOWEL. ON MY WAY...... BUT "NEXT DAY". NO PAIN BUT RED WITH BLISTERS....IN THE ARM PIT. WHATS THE BEST CURE FOR THIS SITUATION ??KRB