The Fitzpatrick scale, named after its creator, Harvard dermatologist Thomas B. Fitzpatrick, is a widely used classification system that has 6 categories, evaluating individual skin types' response to UV radiation. Here are the details for each type:

• Type I: Pale white skin, always burns, never tans
• Type II: White or fair skin, burns easily, tans minimally
• Type III: White, fair to beige, burns moderately, tans uniformly
• Type IV: Beige or light brown, burns minimally, tans well
• Type V: Moderate brown, rarely burns, tans profusely
• Type VI: Dark brown to black, never burns, tans profusely

This system is valuable for determining how different skin types respond to sun exposure and is often used to guide sun protection recommendations, including sunscreen use and sun avoidance, as well as in aesthetic procedures, such as laser treatments.