A comparison of erythema reaction in two ultraviolet irradiation devices

A comparative study of erythema reaction using ultraviolet therapy devices with different irradiance

Status

Active, not recruiting

Phases

Phase 2

Study type

Interventional

Source

JPRN

Registry ID

JPRN-jRCTs032190128

Enrollment

Registered

2019-11-05

Start date

2019-11-30

Completion date

Unknown

Last updated

2026-06-29

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Health Condition(s)

Interventions

Irradiate at 80, 100, 120, 140, 160, 180, and 200 mJ/cm2, respectively, using ultraviolet therapy equipment at 50 mW/cm2 and 150 mW/cm2

Eligibility

Sex/Gender

All

Inclusion criteria

Inclusion criteria: Target patients who meet all the following conditions. 1) Over 20 years old and under 65 years old 2) Those who can agree with the document regarding participation in this examination

Exclusion criteria

Exclusion criteria: 1) photosensitivity 2) keloid diathesis 3) pregnant or having possibility of pregnancy 4) breast-feeding 5) any skin disorder in upper abdominal skin 6) any tattoo or pigmentation in upper abdominal skin 7) having history of sunburn within 2 months 8) having any medicines causing photosensitivity 9) inappropriate cases

Design outcomes

Primary

Measure	Time frame
Difference in erythema value	—

Secondary

Measure	Time frame
1) The difference of erythema (spectrocolorimeter CM-700d) 2) Difference in erythema in dermoscopy images 3) Micropapules in dermoscopy images 4) Observation of small vesicles in dermoscopy images (number) 5) Determination of average MED of each irradiance 6) Determination of post-operative pigmentation (PIH) in dermoscopy images	—

Contacts

Public ContactYaei Togawa

Chiba university

togawa-yk@faculty.chiba-u.jp+81-43-222-7171

Outcome results

None listed

Source: JPRN (via WHO ICTRP) · Data processed: Jul 3, 2026