A man with a pregnant wife or pregnant woman around him will be familiar with stretch marks, but at the same time, he doesn't know other types of shrink marks. This makes these boys think that they are stretch marks when they have stripes on their stomachs and inner thighs, but they are not. This is not a stretch mark, but another kind of atrophy mark.

If there are stripes on the belly and inner thighs of boys, they are not stretch marks, because they are unique to pregnant women, so these stripes may be growth lines or obesity, which need to be distinguished according to their own situation.

If a boy's body and height grow too fast during his development, growth lines may appear. Most of these growth lines are distributed on the trunk, such as legs, hands and buttocks.

If a boy gains too much weight in a certain period of time, or loses weight in a short period of time, in this case, the elastic fiber tissue of the skin will be damaged, and then obesity lines may appear, mostly in the buttocks and abdomen.

Therefore, there is only one possibility for boys to have growth lines and obesity stripes, which one is to be distinguished according to their own physique and experience. Both growth lines and obesity stripes will only affect their appearance, but will not affect their health.