Is it normal for a 12-year-old child to just expose a part of his penis?

12-year-old child glans just exposed part of whether it is normal phenomenon, generally related to the actual situation.

If the child's glans can be exposed part, but not accompanied by other phenomena, generally belong to the normal situation. May be with the development of the penis, foreskin gradually retreat, the above phenomenon occurs. But if the child's glans exposed part, but also accompanied by pain, swelling, itching and other abnormal symptoms, at this time belongs to abnormal phenomenon, may be caused by inflammation. Inflammatory reaction stimulates glans tissue, leading to abnormal expansion of glans vessels, swelling, breakthrough foreskin, causing glans exposure.