Scar bumps closed injection has a certain effect. The active ingredients of closed needle for the treatment of scars generally include glucocorticoids, fluorouracil, etc. For hyperplastic scars, it is more ideal to improve the effect by injecting the closed needle, generally 10-14 days/times, 3-5 times for a course of treatment, and the specific treatment plan needs to be determined according to the specific conditions of the scar. The indications for closed needle injection are hyperplastic scars such as scar bumps and hypertrophic scars, not for atrophic scars. Adverse effects of closed needle treatment of scars are localized erythema, burning pain, itching and other allergic reactions may occur. Contraindications to closed injection for the treatment of scars: it is contraindicated for those who are allergic to glucocorticoids and fluorouracil. For patients with scars, if you want to improve them by injecting closed needle, it is recommended to go to a regular hospital and under the operation of a professional doctor.