الفهرس 
Title : Studying the phenomenon of persistent stamping marks following fractional CO? laser treatment
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Abstract
Background: Fractional CO₂ laser resurfacing offers a high safety profile with few, usually reversible, complications. Incidence of compli-cations of laser treatment can be reduced by the careful patient selection, proper preoperative planning, and accurate treatment technique. Early de-tection and proper treatment of side effects is the key to avoid poor treat- ment outcomes. Objective: Report the incidence and describe the clinical and histo-logical features of a newly observed complication of CO₂ laser scar re- juvenation, that we named 2fractional stamping marks3. Patients and methods: The study included 171 Egyptian pa-tients with post burn scars, acne scars, post-traumatic atrophic and hyper-trophic scars, post chicken pox scars and post surgical scars. The devel- opment of 2fractional stamping marks3 was reported, photographed, and described individually by three investigators. Those who developed this phenomenon continued fractional CO₂ sessions every four weeks and were followed up for at least six months to witness its progress. All those who developed 3fractional stamping marks3 four weeks after the treatment session were biopsied in addition to 20 randomly selected pa- tients with hypertrophic scars. All sections were stained with H and E, mas-son{u2019}s trichome, masson Fontana, and Orcein stain. Results: 2Fractional stamping marks3 developed in 16 patients (9.4%), with significant predilection for post burn hypertrophic scars. The development of fractional stamping marks is significantly related to the darker scar color P value <0.001 and the longer its age P value =0.008