CANKER SORES ON GUMS FROM USING WRONG SEA SALT?

i got my lip pierced and went to buy sea salt...i bought sea salt with iodine in it along with crest pro health mouthwash non-alcohol...i used it for 2 days..on the 3rd day my gums were really sore and raw...by the 4th day my gums had broke out with canker sores all across the bottom gums and on both sides of the top gums!!! my question is...could this outbreak be caused because i used IODIZED sea salt..when it was supposed to be NON-IODIZED sea salt??? i heard iodized sea salt can really damage yur mouth...is this true?? thank you!