S-Space College of Medicine/School of Medicine (의과대학/대학원) Dermatology (피부과학전공) Journal Papers (저널논문_피부과학전공)
Recovery from tanning induced by narrowband ultraviolet B light phototherapy in brown-skinned individuals with psoriasis: Twelve-month follow-up
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- Issue Date
- JOURNAL OF THE AMERICAN ACADEMY OF DERMATOLOGY; Vol.62 3; AB115-AB115
- Background: Pigmentation induced by narrowband ultraviolet B light (NBUVB)
phototherapy can cause complaints in patients with psoriasis, especially those with
brown skin. Nevertheless, the recovery process from tanning after the completion
of NBUVB treatment is not known.
Objective: The purpose of this study was to evaluate the extent of tanning recovery
after the end of NBUVB treatment and determine the time required to recover from
the fully tanned state.
Method: Fifteen psoriasis patients with brown skin were observed over a 12-month
period after completing NBUVB treatment of at least 10 weeks duration. The skin
color changes on the lower back were measured before beginning phototherapy,
upon completion of NBUVB treatment, and subsequently every month for the first
one-half year, then bimonthly for the second one-half year, using two different
reflectance spectrophotometers. The results are presented as the erythema index
(EI) and melanin index (MI), L*a*b* values as recommended by the Commission
Internationale de lEclairge, and the individual typology angle (ITA8).
Results: The mean L* value reached 62.69 by the eighth month after the end of
NBUVB treatment, with no significant difference from the value before beginning
phototherapy. The mean ITA8 approximated the initial angle at the sixth month after
completing NBUVB treatment with no significant difference, thus representing
recovery to the original intermediate skin color. The MI recovered to the initial
values earlier than the L* value and ITA8. The EI appeared the earliest recovery value.
Conclusion: Understanding the recovery process from tanning induced by NBUVB
treatment will improve the patients compliance for treatment and bring higher
efficacy and safety to phototherapy in brown-skinned individuals with psoriasis.
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