An observational study in Skin Barrier Function and Wound Healing, sponsored by ChinaNorm. Recruiting at 1 site in China. Open to female participants aged 18 Years to 60 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2026-05-01.
Sponsored by ChinaNorm · Observational
This clinical observational study investigates the dose-response relationship between laser energy intensity and skin damage/repair by applying different parameter sets of fractional ablative (CO2) and non-ablative (M22) lasers to the inner forearms of approximately 20 healthy Chinese female volunteers (aged 18-60, Fitzpatrick skin types III-V) in a single-center, self-controlled design. Each participant receives both laser types on contralateral arms, with four distinct energy/density combinations per laser applied to separate test areas, and the dynamic skin responses are evaluated at baseline, immediately post-treatment, and at 30 minutes, 1, 2, 3, 4 hours, 7 days, and 10 days thereafter through clinical assessments (edema, erythema, etc.), standardized photography, high-frequency ultrasound (Dermascan), and objective instrumental measurements of skin color (Chromameter CM26dG), melanin/hemoglobin (Mexameter MX18), and barrier function (TEWL via Vapometer). The collected data will be analyzed using descriptive and comparative statistical methods to characterize the acute injury and recovery profiles, aiming to establish a foundational model for future post-procedure cosmetic intervention research.
ChinaNorm is the lead sponsor of 30 studies on the registry; 13 are open to participants now.
Counted across the registry records on this site, refreshed daily.
Approximately 20 healthy Chinese female volunteers, aged 18-60 years with Fitzpatrick skin phototypes III, IV, or V. This population will serve as participants in a self-controlled, observational study to model laser-induced skin injury. Each participant will receive both ablative (CO2) and non-ablative (M22) fractional laser exposures with varying parameters on their inner forearms to observe the dynamic physiological response and recovery process.
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Exclusion Criteria:
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Anti-inflammatory medicines such as prednisone, prednisolone and dexamethasone — not the anabolic steroids used for muscle.
Studies differ in what they allow: check which steroid medicines, routes (tablets, injections, creams, inhalers, eye drops) and doses this study accepts.
A weakened immune system. It can come from an illness, such as HIV or some blood cancers, or from medicines that turn the immune system down, for example after an organ transplant or for an autoimmune disease; steroids at higher doses count.
Read whether the line is about a condition or about medicines, and which medicines and doses it means.
Informed consent
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Corticosteroids (steroids)
Anti-inflammatory medicines such as prednisone, prednisolone and dexamethasone — not the anabolic steroids used for muscle.
Studies differ in what they allow: check which steroid medicines, routes (tablets, injections, creams, inhalers, eye drops) and doses this study accepts.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Immunosuppression
A weakened immune system. It can come from an illness, such as HIV or some blood cancers, or from medicines that turn the immune system down, for example after an organ transplant or for an autoimmune disease; steroids at higher doses count.
Read whether the line is about a condition or about medicines, and which medicines and doses it means.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
This intervention involves the application of ablative fractional laser using a carbon dioxide (CO₂) laser system. Four distinct parameter combinations will be used on four separate test areas (each 1.5cm x 1.5cm) on the participant's inner forearm. The varied parameters include different settings for energy (mJ), spot spacing, and density. The procedure creates microscopic columns of thermal injury in the skin to study the acute tissue response and subsequent healing process. The specific device and parameters are part of the study protocol and are not being evaluated for a new indication.
This intervention involves the application of non-ablative fractional laser using a 1565 nm wavelength laser system (e.g., M22 ResurFX). Four distinct parameter combinations will be used on four separate test areas (each 1.5cm x 1.5cm) on the participant's inner forearm. The varied parameters include different settings for energy (mJ) and density. The procedure delivers focused photothermal energy to the dermis without disrupting the epidermis, aiming to study the sub-surface tissue response and recovery dynamics. The specific device and parameters are part of the study protocol and are not being evaluated for a new indication.
Change in Composite Clinical Skin Damage Score as Assessed by Clinician
Time frame: From baseline (immediately before laser exposure) to 10 days post-exposure. Assessments are conducted at baseline (T0), immediately post-exposure (Timm), and 30 minutes, 1, 2, 3, 4 hours, 7 days (T7d), and 10 days (T10d) post-exposure.
Change in Skin Color Parameters (L, a, b*, ITA°) measured by Chromameter CM26dG
Time frame: From baseline (immediately before laser exposure) to 10 days post-exposure. Assessments are conducted at baseline (T0), immediately post-exposure (Timm), and 30 minutes, 1, 2, 3, 4 hours, 7 days (T7d), and 10 days (T10d) post-exposure.
Change in Melanin and Hemoglobin Index measured by Mexameter MX18
Time frame: From baseline (immediately before laser exposure) to 10 days post-exposure. Assessments are conducted at baseline (T0), immediately post-exposure (Timm), and 30 minutes, 1, 2, 3, 4 hours, 7 days (T7d), and 10 days (T10d) post-exposure.
Change in Transepidermal Water Loss (TEWL) measured by Vapometer
Time frame: From baseline (immediately before laser exposure) to 10 days post-exposure. Assessments are conducted at baseline (T0), immediately post-exposure (Timm), and 30 minutes, 1, 2, 3, 4 hours, 7 days (T7d), and 10 days (T10d) post-exposure.
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