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| Diode Laser | Diode lasers for hair removal were approved by FDA and came into the market in the U.S. in 1997. This laser is often called "promising," but there is few published clinical data.
Published Data Review:
 As with other types, this laser is effective in treating ingrown eyelashes. One study reported patients had 60% sparse regrowth at 9 months (the rest had more), and 30% had temporary skin color change. Another research observed about 90% of subjects had reduction in color and diameter at 9 or 12 months, which can be compared with ruby. The first published study observed less than 5% to 13% reduction at 8 months. A short-term investigation observed 34% reduction at 3 months. A longer study showed between 53% and 34% reduction at 6 months and about 20 months.
Unpublished Data Review:
 Unpublished data showed that hairs stop growing during 1-3 months. They found 11% of patients had no permanent result, and 16 to 42% of clients had reduction at 9 months. Biopsies said about fine vellus hairs, which appear after regrowing terminal hairs. Vellus hairs were observed to be an average of 20% thinner in diameter. 20% of patients suffered from skin color changes lasting 1 to 3 months. 38% of clients were observed to experience 26-47% reduction at 12 months. Another unpublished study noticed super-long pulse might be safer on darker skin types.
One unpublished report on 125 patients noticed 112 averaged 60% reduction following two procedures. One in five clients have 60% reduction at over 6 months.
Side Effects
Side effects are possible. One published report noticed a severe skin reaction similar to hives (urticaria vasculitis) after laser procedure.
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