Patch testing is commonly used for new product development, formula changes, sensitive-skin related products, leave-on products, and buyer audit documentation. It records skin responses under defined contact conditions as part of product safety assessment documentation and is not used for disease judgment.
Items to Confirm Before Testing
| Item | Review Focus |
|---|---|
| Sample information | Confirm product name, batch, formula version, use method, and leave-on or rinse-off attribute. |
| Test condition | Define test site, sample amount, contact duration, occlusive or semi-occlusive method, and observation points. |
| Participant management | Confirm inclusion/exclusion criteria, informed consent, process records, and handling of abnormal observations. |
| Result recording | Record erythema, edema, irritation sensation, delayed reaction, and other observable changes. |
| Report use | Separate R&D screening, filing support, platform documents, buyer audit, and risk review. |
Report Boundary
A patch testing report should match the tested sample, method, participant condition, and observation period. Formula, fragrance, preservative system, use method, or target-user changes may require further review.
Green Ark Recommendation
Green Ark (Shenzhen) Certification Co., Ltd. recommends checking ingredient compliance, microbiology, heavy metals, and restricted-substance screening before patch testing. For sensitive-skin, child-related, or frequently used products, a more complete safety assessment document package should be planned in advance.
