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| Ruby laser | Several well-organized British studies by Liew and colleagues showed interesting facts about ruby laser safety and efficiency. One large study noticed an average of 56% reduction at an average of 6 months after an average of 2 treatments. But:
• Histological investigations found injury only went to about 1.5 mm at 20 J/cm2 “The laser damage is not enough to hurt the hair shafts and to achieve permanent hair destruction.”
• Although success was observed to depend on hair follicle eumelanin content, not only melanin content or growth cycle can cause the “unpredictable response” in laser treatment.
• Another series of histological studies after laser procedure found damaged follicles were “randomly dispersed amongst intact follicles.” It is noted that “the exact mechanisms of hair removal and the potential injury to other structures of skin are not investigated at all.” This is proved by recent data suggesting laser affects oil (sebum) making in almost all patients.
• One well-organized measurement showed the temperature of hair follicle in those hair shafts that had damage after treatment. The temperature ranges from 5 – 30 degrees C. This might explain the “unpleasant outcome.”
• Although some casual observation and histological samples noticed the regrowth of treated hair, which is finer in texture. A quantified analysis found no statistically significant change in follicle diameter at 7 months. A second histological study reported that there is no permanent follicle death after one ruby laser treatment. Third studies observed some follicles were affected but they found that hairs in early anagen were not affected.
They also can’t find no histological evidence of cellular hyperproliferation or oxidative stress, proving laser is safer in comparison to UV radiation.
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