One brittle nail only? the rest of my nails are strong?

this is so weird


All my toenails are quite strong and not brittle at all


except for one of them


it has always been this way since 4 grade that nail is like blackish and brittle


why is that?One brittle nail only? the rest of my nails are strong?
It could be infected, bruised, ingrown, all kinds of reasons as to why it may look the way it does.





I would go see a foot doctor just in case.


And try to do it soon. Because if it is ingrown


it can be really painful.One brittle nail only? the rest of my nails are strong?
U could be lacking something in your diet?