I'm 30, male, in fairly good health, physically active. I've recently had weird issues with a nail on my toe (when I cut another nail it goes off finely, this mostly breaks off piece by piece somehow). Today I noticed that my nail fold is discolored, and I've been told these things should be taken seriously. The only thing I can think of is that I do a lot of leg kicks, kicking, and maybe I've hit my toe but I don't remember. Also, I've never had any black/bluish bands or lines on the nail itself. Thank you! Here is a pic of the nail:

https://imgur.com/b5ajgeu