Puffiness of coronary band?

My horse - 16 hh Paint, 11 y/o, gelding - coronary bands(each hoof) is a little puffy/swollen. Not tender to touch, no lameness. He also has very soft heels but since we live in a wet environment that can be attributed to water log. He has rain rot on his back legs, which I am currently treating - are the puffy coronary bands anything related/ to worry about? Just trying to figure out whats going on