Lesson 7-
Knowing your Skin and Skin pH
Your skin does not need fixing.
It needs understanding.
This module will guide you into the true foundation of healthy skin—your skin barrier—and how pH quietly governs everything from hydration to sensitivity.
The Skin Barrier
Your skin barrier lives in the outermost layer of your skin:
the stratum corneum.
It functions like a brick wall:
-
Skin cells = bricks-
-
Lipids (fats) = mortar
-
This structure is designed to:
-
Lock moisture in
-
Keep irritants, allergens, and bacteria out
When your barrier is balanced:
-
Skin feels soft, supple, and calm-
-
Hydration is retained
-
Products absorb effectively
When your barrier is compromised:
-
Dryness, flaking, tightness
-
Sensitivity or stinging
-
Breakouts, redness, inflammation
-
Most skin concerns begin with a weakened barrier.
The Lipid Matrix
Your barrier is held together by a delicate balance of lipids:
- Ceramides → structure + integrity
- Cholesterol → flexibility
- Fatty acids → nourishment + fluidity
When these are depleted (through over-cleansing, harsh actives, ageing, or stress),
the barrier begins to break down.
---
Skin pH + The Acid Mantle
Healthy skin sits within a slightly acidic range:
👉 pH 4.5 – 5.5
This is known as the acid mantle—a fine, invisible film that protects your skin.
The acid mantle supports:
-
Healthy skin microbiome
-
Protection against harmful bacteria
-
Enzyme activity for barrier repair
What disrupts skin pH?
-
Harsh or foaming cleansers
-
Over-exfoliation
-
Tap water (often slightly alkaline)
-
Hormonal shifts (Puberty and Menopause)
-
Stress
When the skin becomes more alkaline:
-
Barrier function weakens
-
Sensitivity increases
-
Breakouts and irritation become more likely
Barrier Repair – The Bunyah Botanicals Way
Barrier repair is not about adding more.
It is about returning to balance.
Focus on simplicity:
-
Gentle cleansing
-
Avoid stripping the skin of its natural oils
-
Lipid replenishment
-
Support the barrier with nourishing oils (jojoba, meadowfoam, squalane-style oils)
-
Hydration
-
Use humectants like glycerin or hyaluronic acid
-
Reduce actives temporarily
-
Allow the skin to rebuild
A quiet truth
-
Healthy skin is not created through intensity.
-
It is restored through consistency, nourishment, and respect.
Key Takeaway
Your skin barrier is your foundation.
Protect it, and everything else begins to fall into place.
Knowledge Check
Take a moment to reflect, grab a pen and paper and answer below:
---
1. Where is the skin barrier located?
A. Dermis
B. Stratum corneum
C. Hypodermis
D. Sebaceous layer
---
2. In the “brick wall” model, what represents the mortar?
A. Proteins
B. Water
C. Lipids
D. Collagen
---
3. Which of the following is NOT a primary skin lipid?
A. Ceramides
B. Cholesterol
C. Fatty acids
D. Hyaluronic acid
---
4. What is the ideal skin pH range?
A. 2–3
B. 4.5–5.5
C. 6.5–7.5
D. 8–9
---
5. When skin becomes too alkaline, what occurs?
A. Barrier strengthens
B. Oil production stops
C. Barrier weakens and irritation increases
D. Skin thickens
---
6. Which factors can disrupt skin pH? (Select all that apply)
A. Harsh cleansers
B. Over-exfoliation
C. Gentle oils
D. Tap water
---
7. What is the acid mantle?
A. A collagen layer
B. The skin’s acidic protective film
C. A gland
D. A hydration layer
---
8. What best supports barrier repair?
A. Frequent exfoliation
B. Strong actives daily
C. Gentle, nourishing routine
D. Over-cleansing
---
✅ Answers
1. B
2. C
3. D
4. B
5. C
6. A, B, D
7. B
8. C
