The color of glans penis is purple-blue, is it normal?

Suggestion: The color of glans penis is dark red, especially at the edge of glans penis. Because of the abundant nerve endings, abundant blood supply and frequent friction, it is very normal for the glans penis to darken when the penis is erect. If the root of the glans penis is purple, that is, the edge of the glans penis turns dark red with a little purple, there should be no problem.