Sore on horses chin from quick stop bridle?

a href="http://www.google.com/imgres?imgurl=http://www.twentyhoovestack.com/images/14333.jpg&imgrefurl=http://www.twentyhoovestack.com/index.php%3Fmain_page%3Dproduct_info%26products_id%3D925&usg=__QU9Ovw9y60iMiHdHlIBzpZHhSYg=&h=550&w=325&sz=17&hl=en&start=0&sig2=a__kjSdd7doiyBWdgHPZLA&zoom=1&tbnid=AbQ2ZEDO51aRSM:&tbnh=104&tbnw=61&ei=JQXQTbj3OYfVgAepgeG5DA&prev=/search%3Fq%3Dquick%2Bstop%2Bbridle%26um%3D1%26hl%3Den%26sa%3DN%26biw%3D1003%26bih%3D504%26tbm%3Disch0%2C76&um=1&itbs=1&iact=hc&vpx=115&vpy=101&dur=4502&hovh=292&hovw=172&tx=107&ty=249&page=1&ndsp=20&ved=1t:429,r:14,s:0&biw=1003&bih=504" rel="nofollow"http://www.google.com/imgres?imgurl=http…/a <--- that's similar to what i used yesterday and at the end of the day i notices a patch on the left side of my horse's chin where it looked like the metal of the bridal had rubbed could the bridle of caused that and what should i do now?