This group includes 25 patients; all the participants received low level laser (Excimer laser) in a series of eight treatment sessions that was performed twice per week. The radiation exposure time is 10 minutes during the procedure, a maximum dose of 0.65 J/cm², and 6 different spot sizes to avoid healthy skin. large spot size (20 cm²).

This group includes 25 patients; all the participants received polarized light (Bioptron Pro l) in a series of eight treatment sessions that was performed twice per week. The radiation exposure time is 10 minutes during the procedure; a device is fixed at a distance of 10 cm from the treatment area (face), light spot size 19 cm2 average power density is 40 mille watt per cm², and a dose of 2.4 J/cm² per minute.

Excimer laser patients undergo ultraviolet b phototherapy treatments at a physical medicine clinic twice a week for four weeks. The device uses a 308nm beam of coherent light, with six spot sizes to avoid healthy skin. The radiation exposure time is 10 minutes, with a maximum dose of 0.65 J/cm². Personal protection standards include wearing protective eyewear for the retina and choroid, as they absorb visible light radiation, which can cause keratoconjunctivitis or cataracts. The thermal effect of the laser can cause superficial carbonization of the epidermis, phlyctens, or erythema, so non-flammable gloves are recommended.

For the study, we recruited males and females with mild to moderate acne according to the Investigator's Global Assessment (IGA) scale, where the severity of acne and the type of lesions was assigned to it.

the scoring ranges from 0 to 4. Zero indicates clear skin with no inflammatory and non- inflammatory lesions, while 4 indicates severe lesion with Many comedones and inflammatory lesions, ≤ several nodules and cysts

Digital Facial photographs, included in the photographic documentation, were taken by (Nikon Camera), before the procedure and four weeks after the end of the whole therapy.

Digital facial photographs will be taken for each patient at the base line and end of the fourth week to track the development of acne lesions and evaluate treatment effectiveness, using the same method for each patient.