• Medically speaking, ‘stretch marks’ are a type of scarring that develops when the skin stretches or shrinks quickly. This typically happens during puberty, pregnancy as well as weight loss and gain. The skin has three layers: the hypodermis (deepest layer), the dermis (the middle layer), and the epidermis (outer layer). Stretch marks are formed in the dermis.
  • As your body grows naturally, the connective fibres in the dermis cause the collagen and elastin (which make up much of our skin’s structure) to rupture; so as the skin heals, stretch marks may appear.