Patience is the remedy. you could treat it with fungus control but it’s expensive and prob not worth it at this point in the season. TBH your lawn looks pretty good
you strained/pulled your calf. don't do anything strenuous, R.I.C.E, and you will be way better in 2 weeks.
been there, done that. Last time I did it so bad I had bruising-around the back of my ankle.