A friend recently asked me for advice, saying that the 6-year-old child in the family used to be able to turn over his foreskin, but recently he could not turn over it. The child had a history of itching in the penis some time ago, so I considered the possibility of glans inflammation and suggested further circumcision. I was suspicious of the possibility of “atrophic sclerosing moss”, so I kept an eye out and sent the cut foreskin for a pathology, which finally confirmed that it was: atrophic sclerosing moss. Atrophic sclerosing moss is a relatively rare clinical skin disease, harmful and often overlooked by everyone, can cause urethral stricture, and in severe cases cause urinary obstruction, the characteristic damage is painless atrophic hypopigmented patches that gradually invade the glans surface around the urethra. Atrophic sclerosing moss is predominantly preponderant in children, with white sclerotic scarring on the foreskin and the gradual formation of secondary prepuce, often accompanied by chronic sclerosis and atrophy of the glans. Clinicians often do not know enough about atrophic sclerosing moss in children, and most diagnose it as prepuce, glansitis or occult penis before the pathology is confirmed. In fact, the clinical course of atrophic sclerosing moss in children tends to be more severe. 80% of children with atrophic sclerosing moss are already in the middle to late stages when diagnosed, and up to 93% of children even have secondary prepuce. 27% of patients require urethrotomy or urethroplasty due to involvement of the urethra, and 22% require more complex urethroplasty due to involvement of the anterior urethra. Therefore, it is important to determine the possibility of atrophic sclerosing moss in children who have not been previously circumcised once circumcision or foreskin adhesions are detected. The cause of atrophic sclerosing moss is still unclear, but studies have found that 98% of patients with atrophic sclerosing moss are not circumcised, and atrophic sclerosing moss rarely occurs in those who have been circumcised, so it is basically clear that the foreskin factor is an independent risk factor for atrophic sclerosing moss. Treatment of atrophic sclerosing moss includes glucocorticoids, calcium-regulated neurophosphatase inhibitors, laser, photodynamic, and surgical procedures as necessary, including timely circumcision for prevention and treatment of urethral strictures caused by atrophic sclerosing moss. Atrophic sclerosing moss is rare clinically, often difficult to diagnose and extremely easy to be ignored, so when we find abnormal hypopigmented patches on the glans or foreskin or foreskin can not be turned up, must be timely consultation, so that the foreskin is no longer confused because it can not be turned up, do not be “shy” and delay the time to consult.