If you have ever Googled “why do stretch marks happen,” you have probably found vague answers: “your skin stretches too fast.” That is technically true — but it explains nothing about what is actually happening beneath the surface, or what you can actually do about it.
Here is the science, explained clearly.
Your Skin Has Three Layers — and Stretch Marks Happen in the Middle One
Your skin is made up of three main layers:
The epidermis — the outermost layer you can touch. It renews itself approximately every 28 days.
The dermis — the middle layer, made primarily of collagen and elastin fibres. This is where stretch marks form. The dermis is the structural scaffolding of your skin: it gives skin its strength, thickness, and ability to bounce back after being stretched.
The hypodermis (subcutaneous layer) — the deepest layer, containing fat and connective tissue.
When the dermis is stretched faster than it can repair and remodel itself, the collagen and elastin fibres tear. This tearing is what creates a stretch mark.
The Role of Collagen and Elastin
Collagen is the most abundant protein in your body. In skin, it forms thick bundles of fibres arranged in a basket-weave pattern, giving skin its tensile strength.
Elastin is a protein that gives skin its elasticity — its ability to stretch and then return to its original shape. Think of elastin like a rubber band woven through the collagen scaffolding.
The problem arises when the skin is stretched faster than fibroblasts (the cells that make collagen and elastin) can produce new fibres — or when cortisol is elevated, actively suppressing fibroblast activity — or when the body’s production of collagen and elastin is already reduced with age and declining estrogen.
What Happens During Pregnancy Specifically
Pregnancy creates the perfect storm for stretch marks: the abdomen expands by up to 40% over 9 months, cortisol rises and inhibits collagen-producing fibroblasts, and relaxin and progesterone soften connective tissue. The skin is being stretched at the very time its ability to produce structural support is reduced.
This is why stretch mark prevention during pregnancy requires consistent, proactive care — not reactive treatment after the marks appear. RURUHONEY Belly Oil is designed specifically for this: applied from the first trimester, its 9 botanical oils hydrate and nourish the skin before it is placed under the stress of rapid expansion.

What Happens After a Stretch Mark Forms
Immediately after the dermis tears, the body responds with inflammation. Blood vessels near the tear dilate, which is why fresh stretch marks are red, pink, or purple (striae rubrae). Over months, the body repairs the tear with scar collagen, and the mark fades to silver or white (striae albae).
Why this matters for treatment: Red or pink marks are in the active inflammatory phase. This is when botanical oils — particularly those rich in retinol precursors and essential fatty acids — have the greatest impact. Once a mark has turned white, the scar is mature and significantly harder to affect.
RURUHONEY Belly Oil is most effective when started early — during pregnancy prevention, or when marks first appear as red or pink.
Why RURUHONEY Belly Oil Works — The Mechanism
RURUHONEY Belly Oil’s formulation works through several mechanisms:
Barrier maintenance and hydration. Rosehip, sweet almond, jojoba, and coconut oil integrate into the skin’s lipid barrier and maintain optimal hydration — keeping skin supple and extensible under tension.
Fatty acid delivery. Grape seed and argan oils are rich in linoleic acid (omega-6) and oleic acid (omega-9) — the essential fatty acids the dermis uses as building blocks for skin cell membranes. Olive oil adds squalene, a naturally occurring skin lipid.
Provitamin A from rosehip. Rosehip seed oil contains trans-retinoic acid, a naturally occurring vitamin A acid that signals fibroblasts to produce collagen and accelerates cell turnover in the epidermis.
Anti-inflammatory activity. Argan and jojoba oils calm the inflammatory response in fresh stretch marks, reducing scar severity.
Massage stimulation. The physical act of massaging RURUHONEY Belly Oil into skin increases local blood flow and lymphatic drainage, enhancing fibroblast activity and nutrient delivery to the dermis.
All of this from 9 botanical oils — no parabens, no synthetic ingredients, no artificial fragrance. Scented only with grapefruit and ylang ylang essential oils. 3rd party lab tested and awarded Best Anti Stretch Mark Oil 2025 by Baby Talk Magazine.
Frequently Asked Questions
Q: What actually causes stretch marks — is it really just stretching? A: Stretching is the trigger, but the underlying cause is a combination of the stretch rate exceeding the skin’s ability to produce new collagen, and reduced fibroblast activity from elevated cortisol or declining hormones. It is a structural event in the dermis — the middle layer of skin — not just a surface issue.
Q: Why do stretch marks appear in different colours? A: Fresh stretch marks are red or purple because they are inflamed. Over time they fade to silver or white as scar tissue matures. The colour is a reliable indicator of how recently the mark formed — red or pink marks respond significantly faster to treatment with RURUHONEY Belly Oil than older white marks.
Q: Does collagen cream work on stretch marks? A: Collagen molecules in topical creams are too large to penetrate the dermis. Rather than applying collagen, the goal is to support your skin’s own collagen production — through vitamin A derivatives (present in rosehip seed oil), essential fatty acids (in grape seed and argan), and skin-compatible lipids (in jojoba and coconut). RURUHONEY Belly Oil delivers all of these in one formula.
Q: Can stretch marks form on any part of the body? A: Yes — most commonly on the abdomen, breasts, hips, thighs, buttocks, upper arms, and lower back. RURUHONEY Belly Oil can be applied to all these areas — not only the belly.
Q: Is there a way to prevent stretch marks entirely? A: There is no absolute guarantee, but consistent twice-daily use of RURUHONEY Belly Oil from early pregnancy (or from the start of any period of rapid physical change), combined with adequate nutrition and hydration, significantly reduces both the likelihood and severity of stretch marks for most women.
Q: Where can I buy RURUHONEY Belly Oil in Malaysia? A: RURUHONEY Belly Oil is available on the official website at ruruhoney.co, TikTok Shop, Shopee, and at Watsons stores nationwide across Malaysia. Watsons is the most convenient option for same-day purchase — no waiting for delivery.
RURUHONEY Belly Oil — 9 botanical oils, no synthetics, 3rd party lab tested. Awarded Best Anti Stretch Mark Oil 2025 by Baby Talk. [Explore the ingredients.]