
Greetings,
I have the same thing.
I am uncut and my glans was smooth, and then this crack appeared overnight shortly before turning 14.
I have been told it is nothing to worry about by 4 different doctors and that it is just a normal variant among penis heads.
It has not caused me any problems and I have had it for 49 years.
I have come to terms that this is just the way I am.
I don’t know what this crack is called.
Surely there must be a name for it, but I have found nothing.
Also, I don’t know how it formed.
My guess is that I am genetically programmed for the connective tissues to break down between the glans and corona.
It might be encouraging for you to know that this crack is not an uncommon feature in penis heads, among both circumcised and uncircumcised men.