Concealed penis (concealed penis) refers to the penis hidden under the skin, the appearance of the penis is short, the foreskin like a bird’s beak wrapped around the penis, and the body of the penis is not attached, the dorsal side is short, the ventral side is long, the inner plate is more, the outer plate is less. Holding the penis in the hand and pushing the surrounding skin back at the same time can reveal the normal penile body. In obese children, when fat accumulates in the lower abdomen, especially in the prepubic area, the penis can be hidden. There is a great deal of debate about the treatment and age of surgery for an invisible penis. If the foreskin can be turned up to expose the head of the penis, surgery may not be necessary. Most cryptorchid penises gradually improve with age. Cryptorchid penises reported in adult urology are rare. Surgery is indicated only for those with recurrent foreskin infections; difficulty in urination; and difficulty in turning out the foreskin because of an older age and a narrow foreskin opening. The goal of the surgery is to widen the opening of the foreskin and expose the head of the penis. Care should be taken not to do a simple circumcision of the wood.