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Assessment of the usefulness of skin phototype and skin color as the parameter of cutaneous narrow band UVB sensitivity in psoriasis patients
Author(s) -
Youn Jai Il,
Park Je Young,
Jo Seong Jin,
Rim Jong Hyun,
Choe Yong Beom
Publication year - 2003
Publication title -
photodermatology, photoimmunology and photomedicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.736
H-Index - 60
eISSN - 1600-0781
pISSN - 0905-4383
DOI - 10.1034/j.1600-0781.2003.00047.x
Subject(s) - dermatology , phototype , erythema , sunburn , psoriasis , medicine , skin type , colorimeter , optics , physics
Background: Many reports have been released to assess skin types, skin colors and cutaneous sensitivity to broad band UVB or UVA. Objective: This study was performed to investigate the usefulness of skin type and skin color as the parameter of narrow band UVB (NBUVB) sensitivity. Methods: The minimal erythema dose (MED) of 40 psoriasis patients was investigated by irradiating several doses ranging from 200 to 1500 mJ/cm 2 . Before phototesting, the skin color of buttock was measured with a tristimulus colorimeter. Results: The median and mode value of MED of NBUVB was 950 mJ/cm 2 . Skin type was well correlated with the MED and there was a significant relationship between the L * value and MED, but not for the a * and b * values. Conclusion: The MED value of NBUVB in our study is a basic data to set the phototherapy protocol. Our result showed that skin type and L * value might be useful for predicting the sensitivity to NBUVB irradiation.