ỨNG DỤNG COLORIMETER TRONG THEO DÕI HỒNG BAN SAU MỤN ĐIỀU TRỊ BẰNG ÁNH SÁNG XUNG CƯỜNG ĐỘ CAO

Abstract

Objectives:  To evaluate the applicability of colorimetry in measuring post-acne erythema (PAE) in acne patients. Methods: This observational study involving 30 patients diagnosed with PAE who visited the Department of Dermatology - Aesthetic Dermatology, University Medical Center Ho Chi Minh City, from September 2024 to May 2025. The a* parameter of the facial skin was measured using a colorimeter, and data were analyzed using SPSS version 25. Results: The median age of the patients was 23.5 years; the majority were female (80%). Most patients had low sun exposure and improper sunscreen usage habits, with only 13.3% using sunscreen correctly. PAE mainly appeared on the cheeks (100%) and forehead (70%), with mild and moderate severity being predominant. The mean a* value was 16.9 ± 2.7 and gradually decreased after one month of treatment. However, there was no significant association between a* values (either baseline or after one month) and the satisfaction of either physicians or patients (p > 0.05). Conclusion: PAE is highly prevalent among acne patients, particularly in females and those with darker skin types. The a* parameter can provide an objective assessment of PAE progression, but it should be combined with subjective evaluations from patients and physicians to achieve a comprehensive treatment outcome.