Answer:
The skin of human is made-up of three layers, the dermis, middle layer and the epidermis. What causes white streak is when the is stretched beyond limits due to elasticity that occur. This is as a result of when the skin undergo elasticity and it contracts and expand.
Step-by-step explanation:
Pregnancy stretch marks are pinkish streak around the stomach, breasts and hip, these occur when the collagen and elastin stretch due to pregnancy weight gain. The medical term idstriae gravidarum', which is the Latin word for stripes of pregnancy