I think this is a case of phimosis
.Phimosis refers to the inability to retract the distal foreskin over the glans penis
Physiologic, or congenital, phimosis is a normal condition of the newborn male. In 90% of cases, natural separation allows the foreskin to retract by age 3 years. However, phimosis persisting into late adolescence or early adulthood need not be considered abnormal.
U can consult an urologist/surgeon to get it corrected surgically which is a very commonly done procedure called circumcision