Chemical Peels - Skin Deep Science
- Definition: Controlled chemexfoliation using topical chemical agents to achieve skin regeneration and remodeling.
- Classification by Depth & Target Layer:
- Very Superficial: Stratum corneum (e.g., low conc. Glycolic acid <30%).
- Superficial: Epidermis to papillary dermis (e.g., Glycolic acid 30-70%, Jessner’s solution).
- Medium: Papillary to upper reticular dermis (e.g., TCA 35-50%).
- Deep: Mid-reticular dermis (e.g., Phenol, high conc. TCA >50%).
⭐ Baker-Gordon phenol peel is a deep peel; cardiac monitoring is essential due to risk of arrhythmias from phenol absorption.
Chemical Peels - Agent Arsenal
| Agent | Type | Common Conc. | Depth | Key Indications | Neutralization | Specific Pointers/Toxicity |
|---|---|---|---|---|---|---|
| Glycolic Acid | AHA | 20-70% | Superficial | Acne, PIH, photoaging, melasma | Water, $NaHCO_3$ | Smallest molecule AHA; monitor frosting |
| Lactic Acid | AHA | 10-30% | Superficial | Sensitive skin, rosacea, moisturizing | Water | Milder AHA, hydrating; good for dry skin |
| Salicylic Acid | BHA | 20-30% | Superficial | Acne (comedonal), oily skin, PIH | Self-neutralizing (most) | Lipophilic, comedolytic; Salicylism (rare) |
| Jessner's Solution | Mix | Salicylic 14%, Lactic 14%, Resorcinol 14% | Superficial to Medium | Acne, photoaging, PIH | Self-neutralizing | 📌 SLR (Salicylic, Lactic, Resorcinol); Resorcinol: allergy, thyroid dysfunction |
| TCA | TCA | 10-25% (Sup) 35-50% (Med) | Superficial Medium | Acne scars, fine lines, AKs, lentigines | Water, $NaHCO_3$ | Frosting indicates depth; ↑risk scarring/dyspigmentation with ↑conc. |
| Phenol (Baker-Gordon) | Phenol | 88% (pure) or BG (45-50%) | Deep | Severe photoaging, deep wrinkles, resistant scars | Mineral oil (skin) | Cardiotoxic (ECG, IV fluids), hepatotoxic, nephrotoxic; prolonged hypopigmentation, lines of demarcation |
Chemical Peels - Peel Protocol
- Pre-Peel:
- Priming agents: Topical retinoids, hydroquinone for 2-4 weeks.
- Antiviral prophylaxis (e.g., acyclovir) if history of herpes simplex.
- Assess Fitzpatrick skin type.
- Procedure:
- Thoroughly cleanse skin; protect sensitive areas (eyes, nares, lips).
- Apply peel solution evenly and rapidly.
- Monitor for endpoint: e.g., erythema, frosting (TCA).
- Neutralization (e.g., sodium bicarbonate for glycolic acid).
- Post-Peel:
- Soothing agents: Cool compresses, mild cleansers, calamine.
- Strict sun protection (broad-spectrum SPF >30).
- Emollients to aid healing.
- Detailed patient instructions: Avoid picking, sun exposure.
⭐ TCA frosting levels: Level 1 (faint white blush, erythema visible), Level 2 (white coat with underlying erythema), Level 3 (solid white enamel frosting, no erythema).
Chemical Peels - Uses & Warnings
| Indications | Contraindications |
|---|---|
| * Acne vulgaris (comedonal, mild papulopustular) | * Active infection (herpes simplex, bacterial, fungal) |
| * Melasma, Chloasma, lentigines | * Open wounds, active dermatitis, sunburn |
| * Photoaging (fine wrinkles, texture) | * History of keloids or hypertrophic scarring |
| * Superficial acne scars, PIE, PIH | * Unrealistic patient expectations or compliance |
| * Dyschromias (e.g., ephelides) | * Pregnancy/Lactation (relative for some peels) |
| * Isotretinoin use (within preceding 6 months) | |
| * Aspirin/salicylate allergy (for salicylic acid) |
Chemical Peels - Side Effect Savvy
- Common Complications:
- Erythema, edema, pain: Cool compresses, topical steroids, oral analgesics.
- PIH (Post-Inflammatory Hyperpigmentation): Common in darker skin. Prevention: strict sun protection. Treatment: hydroquinone.
- Desquamation: Expected process; manage with bland emollients.
- Serious/Rare Complications:
- Scarring (keloids): Intralesional corticosteroids.
- Infection (bacterial/herpetic): Prophylactic antivirals (HSV history). Treat promptly with antimicrobials.
- Hypopigmentation: Often permanent; very difficult to treat.
- Allergic reactions: Antihistamines, systemic steroids if severe.
- Cardiac toxicity (Phenol): Arrhythmias. Requires ECG monitoring, IV fluids, emergency support.
⭐ Phenol peel systemic toxicity (cardiac, renal) relates to dose & area; limit to < 10% BSA per session.
High‑Yield Points - ⚡ Biggest Takeaways
- Superficial peels (e.g., Glycolic acid, Salicylic acid) act primarily on the epidermis.
- Medium-depth peels (e.g., TCA 35-50%) reach the papillary dermis.
- Deep peels (e.g., Phenol, high TCA >50%) penetrate to the reticular dermis; Phenol carries cardiotoxicity risk.
- Jessner's solution is a combination peel containing salicylic acid, lactic acid, and resorcinol.
- Key indications include acne vulgaris, melasma, photoaging, and superficial scars.
- Important contraindications: Active infection (e.g., herpes simplex), keloidal tendency, recent isotretinoin use, pregnancy.
- Common complications: Post-inflammatory hyperpigmentation (PIH), hypopigmentation, persistent erythema, scarring, and infection.
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