This is a single-center, randomized, controlled intervention study designed to evaluate the effectiveness of mindfulness intervention on reducing body-focused repetitive behaviors (BFRBs) in children aged 8-18, such as nail-biting, skin-picking, and hair-pulling. Participants will be randomly assigned to either a mindfulness intervention group or a psychosocial education control group. The study aims to assess the impact of the intervention on the severity and frequency of BFRBs, psychological health outcomes such as anxiety and depression, and family dynamics. Data will be collected through standardized psychological assessments. The study's findings will contribute to understanding the role of mindfulness in managing BFRBs and improving emotional and familial well-being in children.

This study investigates the impact of mindfulness-based intervention (MBI) on children aged 8-18 with body-focused repetitive behaviors (BFRBs), including nail-biting, skin-picking, and hair-pulling. BFRBs often lead to psychological distress and impaired daily functioning. Current treatment options are limited, and mindfulness presents a promising non-invasive alternative. The study aims to evaluate the intervention's effectiveness in reducing BFRBs and improving psychological health and family dynamics. Participants will be randomized into two groups: a mindfulness intervention group and a psychosocial education control group. Both groups will participate in a 30-day program designed to address BFRBs, but with distinct approaches.

The mindfulness intervention group will engage in daily mindfulness exercises focusing on deep breathing, body scanning, emotional awareness, and behavior regulation for 10-15 minutes per day. The exercises are structured to build emotional awareness, manage impulses, and foster long-term emotional resilience. The program progresses through foundational mindfulness techniques, emotional acceptance, behavior modulation, and integrating mindfulness into daily life. Parents will actively participate by supervising and supporting their children's practice and recording their progress.

The psychosocial education control group will receive daily educational content designed to enhance emotional regulation and coping strategies. This content will be delivered via text and audio messages and will focus on improving emotional awareness, creating supportive home environments, and building healthy lifestyle habits. Parents will play a key role in implementing and supporting these strategies at home.

Baseline and follow-up assessments will be conducted to evaluate the intervention's effects on psychological health and family dynamics. Key measures include the frequency and severity of BFRBs as well as psychological health scales such as SCARED, CDI, OCI-CV ,s-EMBU-C and PHCSS. Parental mental health and family dynamics will also be assessed using validated tools, including the Conners Parent Rating Scale, SNAP-IV, PSI, and FAD. Assessments will be conducted at baseline (T0), immediately after the intervention (T1), and at a three-month follow-up (T2). Data analysis will focus on pre- and post-intervention comparisons to evaluate the mindfulness program's effectiveness in reducing BFRBs and improving emotional and family outcomes. Participants will be recruited from dermatology and psychiatric outpatient clinics at Children's Hospital of Fudan University . Recruitment will target children who have exhibited significant BFRBs within the last month, with informed consent obtained from their guardians.

Inclusion Criteria:（1）Children and adolescents aged 8 to 18 years. （2）Evidence of significant Body-Focused Repetitive Behaviors (BFRBs) such as nail-biting, skin-picking, or hair-pulling, observed within the last month.

（3）Written informed consent provided by the parent or legal guardian, and child assent provided by the participant.

-

Exclusion Criteria:（1）Presence of severe physical illness or neurological disorders that may interfere with participation in the study.

（2）Participants currently receiving psychological interventions or pharmacological treatments for BFRBs or other psychiatric conditions, and who are unable to temporarily discontinue these treatments.

（3）Presence of significant cognitive impairment that would prevent the participant from completing study assessments or interventions.

-

Individual participant data (IPD) will be shared after publication of primary study results. Data will be de-identified to ensure participant confidentiality. Researchers can request access by submitting a proposal to the study team at [email address]. Approved researchers will receive access via a secure data-sharing platform.

Start Date: 6 months after the publication of the primary study results. End Date: 5 years after the publication of the primary study results.

Individual participant data and supporting information, including the study protocol, statistical analysis plan (SAP), informed consent form (ICF), clinical study report (CSR), and analytic code, will be made available to qualified researchers upon request. Access will be granted for academic and non-commercial purposes only.

Researchers must submit a formal request to dingqiang@fudan.edu.cn, detailing their research objectives, study design, and ethical approval from an institutional review board (IRB) or ethics committee. Once approved, the requested data will be provided through secure channels, ensuring compliance with data privacy regulations and participant confidentiality. Access will be available for a period of 5 years following the publication of the primary study results.

In this study, participants (children and their parents) will be unaware of the specific intervention group (Mindfulness Intervention or Psychosocial Education Control) they are assigned to after recruitment and consent. The random assignment to groups is managed entirely via the JingDong（JD） Health platform, and the interventions (daily mindfulness audio or psychosocial education articles) are delivered automatically through this platform. All outcome assessments (monthly and three-month follow-up surveys) will be conducted online via JD Health as well. Importantly, clinicians do not participate in the randomization, intervention delivery, or outcome assessments. Their role is limited to recruitment and initial consent collection. This ensures that clinicians are not involved in any part of the treatment or evaluation process, maintaining a fully masked design for participants and outcome assessors.