Hello. This Past February I Was Doing My Usual Workouts

Hello. This past February I was doing my usual workouts which always causes my nose to run. When I blew it, 2 dark grey pellet sized balls came out. They were the consistency of clay or playdoh. Each time the mucus that is along with it is clear. Not anything I had ever witnessed before. I hadn’t been around any chemicals and I don’t smoke nor am I around anyone who does. From February to April I’ve blown a total of 5 or 6 out of my nose. From April to today when I have to blow my nose I’ll have clear mucus with light grey in it sporadically but it’s no longer in a ball shape. It’s more of a mucus consistency but doesn’t look like regular mucus. I have no clue as to what this is and I’m hoping it doesn’t have anything to do with brain matter. I’ve never had a head or nasal injury. Any information is appreciated.