8.3 Exfoliation Techniques: Mechanical & Superficial Chemical Peels

Exfoliation Techniques: Mechanical & Superficial Chemical Peels

Exfoliation is the process of removing dead skin cells from the stratum corneum, revealing smoother, brighter skin underneath. Estheticians utilize both mechanical and chemical methods, each with specific protocols, benefits, and contraindications.

Mechanical Exfoliation

Mechanical (or physical) exfoliation uses friction and an abrasive substance or tool to physically buff away dead skin.

Methods of Mechanical Exfoliation

• Gommage: A cream or paste applied to the skin, allowed to dry slightly, and then rubbed off. The friction rolls the product away, taking dead skin cells with it.
• Scrubs: Granular products (containing jojoba beads, ground nuts, or sugar) massaged into the skin.
• Microdermabrasion: A machine-aided mechanical exfoliation technique.

Microdermabrasion Protocols

Microdermabrasion is a highly effective, non-invasive treatment that improves skin texture, reduces hyperpigmentation, and diminishes fine lines.

Types of Microdermabrasion

1. Crystal Microdermabrasion: Sprays micro-fine aluminum oxide (corundum) crystals onto the skin, sandblasting the surface, while a vacuum simultaneously suctions away the crystals and dead skin cells.
2. Diamond-Tip Microdermabrasion: Uses a wand with an abrasive diamond-encrusted tip to physically scratch off the dead skin, paired with vacuum suction.

The Vacuum Suction Factor

The vacuum aspect of microdermabrasion is just as important as the exfoliation. It stimulates blood flow, lymphatic drainage, and cellular turnover. However, the suction must be carefully calibrated to avoid causing erythema, purpura (bruising), or broken capillaries (telangiectasia).

Protocol Steps

1. Cleanse and degrease the skin thoroughly.
2. Ensure the skin is completely dry before starting.
3. Hold the skin taut with your non-dominant hand.
4. Move the wand in smooth, overlapping passes (horizontal, then vertical if a second pass is needed).
5. Avoid delicate areas like the eyelids and lips.
6. Apply a soothing mask, followed by moisturizer and SPF.

Superficial Chemical Peels

Chemical exfoliation uses acids or enzymes to dissolve the desmosomes (intercellular "glue") holding dead skin cells together. Estheticians are only permitted to perform superficial peels, which affect the epidermis. Medium peels (affecting the entire epidermis and upper dermis) and deep peels (reaching the lower dermis) are strictly for medical professionals.

Alpha Hydroxy Acids (AHAs)

AHAs are water-soluble acids derived from fruits, milk, or sugar.

• Glycolic Acid: Derived from sugar cane. It has the smallest molecular size, allowing for deep penetration, making it highly effective but potentially more irritating.
• Lactic Acid: Derived from milk. Larger molecule, gentler, and inherently hydrating. Great for dry or sensitive skin.
• Mandelic Acid: Derived from bitter almonds. Very gentle, good for darker skin tones prone to hyperpigmentation.

Beta Hydroxy Acids (BHAs)

BHAs are oil-soluble, allowing them to penetrate deep into the follicles to dissolve sebum and cellular debris.

• Salicylic Acid: Derived from sweet birch, willow bark, and wintergreen. It is the most common BHA and is highly effective for acneic and oily skin due to its anti-inflammatory and lipophilic properties.

Pre-Peel Prep and Post-Peel Care

Pre-Peel Prep

The skin must be thoroughly cleansed and degreased (often with an alcohol or acetone-based prep solution) to strip away natural oils. Oils act as a barrier; if not removed, the peel will penetrate unevenly, causing patchy results or hot spots.

Neutralizing Chemical Peels

Many peels (particularly glycolic) are time-dependent and must be neutralized to stop the chemical reaction. If left on too long, the acid will continue to burn into the skin. Neutralization is achieved by applying an alkaline solution (such as sodium bicarbonate/baking soda mixed with water) or a commercial neutralizer provided by the manufacturer. Note: Salicylic acid peels are often self-neutralizing and may just require removal with cool water.

Post-Peel Care

After a peel, the skin is vulnerable.

• Avoid direct sun exposure and wear SPF daily.
• Do not pick or pull at peeling skin to avoid scarring and hyperpigmentation.
• Discontinue the use of retinoids, AHAs, or scrubs for several days.
• Keep the skin heavily moisturized.

Contraindications for Advanced Exfoliation

Before performing microdermabrasion or chemical peels, screen clients for the following contraindications:

• Isotretinoin (Accutane) use within the last 6 months: severely thins the skin and impairs healing.
• Active cold sores (Herpes Simplex Virus): Exfoliation can spread the virus across the face.
• Open lesions or sunburn.
• Active, inflammatory acne (Grades 3 & 4): Microdermabrasion can spread bacteria and cause severe inflammation, though BHA peels may be indicated for some acne under careful supervision.
• Recent cosmetic surgeries, laser treatments, or facial waxing (within 72 hours).

Comparison: AHA vs. BHA

Understanding the nuances of these exfoliation techniques allows you to customize treatments safely and effectively, providing significant improvements to your clients' skin health.