Hello, when the penis is not erect, the foreskin covers the whole penis head and urethral orifice, but the foreskin can still be turned up to expose the penis head; If the penis is erect and the foreskin needs to be pushed by hand to completely expose the vulva head, it is considered that the foreskin is too long. But if the foreskin is too long, it will often be accompanied by phimosis. If in adulthood, the mouth of the foreskin becomes narrower, or the foreskin and the glans penis are still adhered, and the foreskin cannot be turned up to expose the urethral orifice or glans penis, which is medically called phimosis.