Adolescent Stretch Mark Causes
While it is generally true that pimples are among the most common skin problems shared by teenagers during puberty, stretch marks are definitely not far behind on the list.
Belly Stretch Marks in Pregnancy – How to Avoid It
So what causes those belly stretch marks to develop? As you put on more weight during pregnancy and as the belly stretches to accommodate the growing baby, the skin is also stretched further. This causes the marks to appear during the seventh month of pregnancy.

