Chemical Peels - Layer by Layer
Chemical peels are classified by their depth of penetration into the skin, influencing indications and outcomes.
| Peel Type | Histological Level Reached | Typical Agents |
|---|---|---|
| Superficial | Stratum corneum to papillary dermis | AHAs (Glycolic 30-70%), BHAs (Salicylic 20-30%), Jessner's, TCA 10-25% |
| Medium-depth | Papillary to upper reticular dermis | TCA 35-50%, Glycolic 70% (prolonged), Jessner's + TCA 35% |
| Deep | Mid-reticular dermis | Phenol (Baker-Gordon formula), TCA >50% |
⭐ The depth of a chemical peel (superficial, medium, or deep) dictates its efficacy for specific indications and its potential risk profile.
Chemical Peels - Acids & Action
| Agent | Type | Conc. | Depth | Key Indications/Properties | Neutralization |
|---|---|---|---|---|---|
| Glycolic Acid | AHA | 20-70% | Superficial | Photoaging, Melasma, Acne; improves skin texture & hydration. | Yes (e.g., water, $NaHCO_3$) |
| Salicylic Acid | BHA | 20-30% | Superficial | Acne vulgaris (comedolytic, lipophilic), oily skin, PIH. | Self-neutralizing |
| TCA | TCA | 10-25% | Superficial | Photoaging, actinic keratoses, lentigines, fine wrinkles, superficial acne scars. | Self-neutralizing (protein ppt) |
| TCA | TCA | 35-50% | Medium | Deeper wrinkles, moderate acne scars, precancerous lesions. | Self-neutralizing (protein ppt) |
| Jessner's Soln | Combo | Salicylic acid 14%, Lactic acid 14%, Resorcinol 14% in ethanol base | Superficial | Acne, hyperpigmentation, photoaging; often pre-peel. | Self-neutralizing |
| Phenol | Phenol | 88% | Deep | Severe photoaging, deep rhytides, significant scars; Cardiotoxic ⚠️, cardiac monitoring. Baker-Gordon: $C_6H_5OH$ + Septisol + Croton oil + Distilled water | Self-neutralizing |
Chemical Peels - Ins & Outs
- Selection Criteria:
- Indications: Photoaging, dyschromia (melasma, post-inflammatory hyperpigmentation/PIH), acne vulgaris, superficial scars.
- Fitzpatrick skin type: Crucial for risk assessment (higher types ↑ PIH risk).
- Contraindications:
- Absolute: Active infection (bacterial, viral, fungal), pregnancy, isotretinoin use (within 6 months), keloidal tendency, unrealistic patient expectations.
- Relative: History of HSV (prophylaxis vital), photosensitizing medications, recent facial surgery/radiation.
- Pre-Peel:
- Thorough counseling: Discuss procedure, risks (e.g., PIH, scarring), benefits, realistic outcomes.
- Informed consent is mandatory.
⭐ A history of herpes simplex virus (HSV) infection is a relative contraindication for chemical peels, especially perioral; prophylactic antiviral therapy (e.g., acyclovir) is mandatory if proceeding.
Chemical Peels - Process & Pitfalls
Procedure:
⭐ Trichloroacetic acid (TCA) peels produce a visible 'frosting' as a clinical endpoint; the intensity and uniformity of this frost (e.g., Level 1: faint erythema with streaky white; Level 2: uniform white with erythema; Level 3: solid white enamel without background erythema) correlates with the depth of penetration.
Pitfalls & Management:
| Complication | Management |
|---|---|
| Persistent Erythema | Topical steroids, Sun protection |
| Post-Inflammatory Hyperpigmentation (PIH) | Sunscreen, Bleaching agents, Retinoids |
| Infection (Bacterial/Viral) | Appropriate antimicrobials (e.g., Acyclovir for HSV) |
| Scarring | Intralesional steroids, Silicone gel sheeting |
| Allergic Reaction | Antihistamines, Topical/Systemic steroids |
High‑Yield Points - ⚡ Biggest Takeaways
- Superficial peels (e.g., Glycolic acid, Salicylic acid) treat acne and mild pigmentation.
- Medium-depth peels (e.g., TCA 35-50%) address fine wrinkles and actinic keratoses.
- Deep peels (e.g., Phenol) for severe photoaging; Phenol carries cardiotoxicity risk.
- Jessner’s solution comprises salicylic acid, lactic acid, and resorcinol.
- Frosting is a key visual endpoint for TCA peels, indicating protein coagulation.
- Post-inflammatory hyperpigmentation (PIH) is a common risk, especially in Indian skin.
- Key contraindications: active herpes infection, recent isotretinoin use, pregnancy.
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