Long-lasting pigmentation more than its intensity is a reliable indicator of skin sun resistance

Dermatology. 2007;215(3):173-9. doi: 10.1159/000106572.

Abstract

Background: The currently adopted method for predicting sun sensitivity is Fitzpatrick's classification which however is based on self-reported burning tendency and tanning ability.

Objective: Determination of the individual UV susceptibility based on non-subjective parameters.

Method: Minimal erythema dose (MED), intensity and duration of pigmentation on days 5, 9 and 16 following 1 MED and the levels of the melanin marker pyrrole-2,3,5-tricarboxylic acid (PTCA) were analysed in non-red-haired subjects (50, aged 20-46 years).

Results: Phenotype groups or phototypes showed a good correlation with PTCA yields and the persistence of pigmentation on day 16, but not with MED values. MED values did not show a significant correlation with PTCA yields. On the other hand, high values on day 16 were exhibited only by subjects having PTCA values higher than 200 ng/mg.

Conclusions: Measurement persistence of pigmentation on day 16 represents a non-invasive and easy-to-perform method to evaluate photoprotection in those individuals escaping straightforward classification based on phenotype or anamnesis.

MeSH terms

  • Adult
  • Dose-Response Relationship, Radiation
  • Erythema / etiology*
  • Female
  • Hair / chemistry
  • Humans
  • Male
  • Melanins / analysis
  • Middle Aged
  • Radiation Tolerance / physiology
  • Skin / radiation effects*
  • Skin Pigmentation / physiology*
  • Skin Pigmentation / radiation effects
  • Spectrophotometry
  • Time Factors
  • Ultraviolet Rays / adverse effects*

Substances

  • Melanins