The Fitzpatrick Scale
Developed by Harvard dermatologist Thomas Fitzpatrick in 1975, the Fitzpatrick scale classifies skin into six phototypes based on two criteria: genetic skin color (inherited complexion) and the skin's response to ultraviolet (UV) exposure (how it burns and tans). It is the standard tool for assessing how aggressively a treatment can be applied and for predicting risk of post-inflammatory hyperpigmentation (PIH).
| Type | Description | Burn Response | Tan Response |
|---|---|---|---|
| Type I | Very pale/ivory skin, blonde/red hair, blue/green eyes | Always burns | Never tans |
| Type II | Fair skin, blonde or light brown hair, blue/hazel eyes | Usually burns | Rarely tans (minimal) |
| Type III | Medium/beige skin, any hair color | Sometimes burns | Sometimes tans (gradual) |
| Type IV | Olive/light brown skin, dark hair and eyes | Rarely burns | Always tans (easily) |
| Type V | Brown/dark brown skin | Very rarely burns | Tans very easily (darkens) |
| Type VI | Dark brown/black skin | Never burns | Deeply pigmented; no visible tan change |
Why Fitzpatrick Type Matters in the Treatment Room
The Fitzpatrick scale directly informs treatment decisions in three main areas:
Chemical Peels
Higher Fitzpatrick types (IV, V, VI) have a greater risk of post-inflammatory hyperpigmentation (PIH) after aggressive peels. Lower concentrations, shorter contact times, and gentler AHA options are preferred for darker skin types. Types I to III generally tolerate more aggressive peel protocols.
Laser and Light Treatments
Many laser systems target melanin. In higher Fitzpatrick types, there is more melanin in the epidermis, which increases the risk of burns, hypopigmentation, or hyperpigmentation. Laser parameters (wavelength, fluence) must be adjusted accordingly. Some lasers are not safe for Fitzpatrick V and VI without significant protocol modifications.
Sun Sensitivity and SPF Education
Types I and II have the highest risk of UV damage and skin cancer from sun exposure. SPF recommendations and post-treatment sun avoidance are non-negotiable for these clients. Types IV through VI have more natural UV protection from melanin but are still at risk for PIH and long-term sun damage.
Post-Inflammatory Hyperpigmentation (PIH) Risk
PIH is a darkening of the skin that occurs after inflammation or injury to the skin. The risk increases with higher Fitzpatrick types because more melanin-producing cells are present and more reactive. Any treatment that causes inflammation (extractions, peels, waxing) carries PIH risk in higher Fitzpatrick types. Pre-treating with skin-brightening agents and applying SPF consistently can reduce this risk.