Open AccessA long‐term evaluation of erythema and pigmentation induced by ultraviolet radiations of different wavelengths
Author(s) -
Suh K.S.,
Roh H.J.,
Choi S.Y.,
Jeon Y.S.,
Doh K.S.,
Bae J.H.,
Kim S.T.
Publication year - 2007
Publication title -
skin research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.521
H-Index - 69
eISSN - 1600-0846
pISSN - 0909-752X
DOI - 10.1111/j.1600-0846.2007.00238.x
Subject(s) - erythema , dermatology , ultraviolet , ultraviolet b , medicine , ultraviolet radiation , chemistry , materials science , optoelectronics , radiochemistry
Background/aims: The long‐term reactions of human skin by different ultraviolet (UV)‐wavebands were not reported. This study was to investigate a time course of erythema and pigmentation induced by UVA‐1, broadband UVA (BBUVA), narrowband UVB (NBUVB) and broadband UVB (BBUVB). Methods: Ten volunteers participated in this study for 6 months. Four skin areas, from the back of each subject, were irradiated with two minimal erythema dose (MED) of four different UV wavelengths corresponding to UVA‐1, BBUVA, NBUVB and BBUVB. Results: For both UVA‐1 and BBUVA, erythema and pigmentation were most pronounced immediately and 1 h after exposure. Erythema rapidly diminished but pigmentation persisted throughout the study. For both NBUVB and BBUVB, test areas reacted with erythema of maximum intensity at 1 and 2 days, respectively. A maximum tanning was reached at 3–6 days for NBUVB and 4–7 days for BBUVB, and the return toward the original point was at 1 and 3 months, respectively. Conclusion: Two MED of UVA produced far prolonged erythema and pigmentation than UVB. For UVA, UVA‐1 and BBUVA showed similar intensity and time course of skin reaction. For UVB, erythema and pigmentation produced by NBUVB were milder in intensity and shorter in a time course than those by BBUVB.