Background and Objectives: Permanent reduction of unwanted hair on skin types V and VI is the most challenging procedure among all hair removal technologies based on selective absorption of light or laser. The objective of this study is to evaluate the safety and efficacy of a low energy pulsed-light device combined with galvanic energy, intended for home-use hair removal on dark skin. Materials and Methods: Fifteen women with skin types V and VI and dark terminal hair in axillaarea self-administrated 6 treatments at 2 week intervals, using a hand-held IPL combined with galvanicenergy device, using HPL (Home Pulsed Light) technology. Hair count and photographs were performed pre-treatment and 1 and 3 months after the last sixth treatment. Adverse events and subject satisfaction scores were recorded. Results: All patients showed a positive clinical response to treatment, with reduction of unwanted hair. Hair counts were significantly reduced by 57.3% 1 month following last treatment and by 44.5% 3 months following last treatment. No adverse events were recorded. Subject satisfaction scores of the device usability and the treatment outcome were high. Conclusions: Low energy pulsed light combined with galvanic energy may be applied safely and effectively for at-home hair removal for people with dark skin types V and VI.
Long-term removal of unwanted hair is the most popular skin treatment worldwide. Over the past decade, various light and laser sources have been advocated for use in the office setting with long term results [
The Infinity Device is a small hair removal home-use device, employing the technology of electrical Home Pulsed Light (eHPL™) (Home Skinovation, Yokneam, Israel). It is a portable hand-held device with spot size of 1 × 3 cm, combining low energy IPL (475 - 1200 nm; 3 - 5 J/cm2) and 200 μA galvanic energy (
Seventeen females, 21 - 60 years old with Fitzpatrick skin type VI who had black hair in their axillae and met the inclusion and exclusion criteria were recruited to the study. Subjects were retained by in office recruitment of existing patients who would be a candidate for hair removal through an IRB (Investigational Review Board) approval study. Fifteen subjects have completed the study. All subjects signed an informed consent form.
Inclusion criteria included healthy females between 21 - 60 years of age with skin type VI, having unwanted
black hair in their axillae and willingness to follow the study protocol. Exclusion criteria included pregnancy and lactating throughout the study period, concurrent severe diseases and history of malignancy, diseases that may be stimulated by light, such as epilepsy and lupus, scarring, inflammation or infection of the area to be treated, history of skin disorders such as keloids and abnormal wound healing, a pacemaker or internal defibrillator device, poorly controlled endocrine disorders as diabetes or PCO, history of bleeding coagulopathies or constant use of anticoagulants, previous photo-epilation hair removal or waxing and plucking in the treatment area during the last three months, history of known photosensitization or the use of a medication known to induce photosensitization; tanned skin in the treatment area within four weeks of the study, and presence of tattoo in the treatment area.
Subjects were given the Infinity device and the instructions for use and were asked to perform the first self- treatment in the investigator’s clinic in the supervision of a qualified trainer who determined the fluence used for each individual following a test spot procedure. Baseline measurements included demographic data, laboratory tests to rule out pregnancy, and initial photography and hair counts in both axillae. Subjects conducted 5 more sessions of self-treatment (total 6) at home at 2 weeks intervals. Follow-up sessions were held in the investigator’s clinic 1, and 3 months following the last treatment. At each follow-up session the treated area was photographed and hair count conducted in a similar way to baseline. Photographs were taken with Nikon D100 camera with 60-mm micro lens. Hair count was done on a predetermined 2 × 2 cm (4 cm2) area, using a small sticker. These stickers have a central cut out area that is a reproducible 2 × 2 cm in size. The axillae with the stickers were also photographed to ensure count in the same area. Furthermore, a transparency sheet was placed over each axilla of the subject, and anatomic locations (such as nevi, freckles, tags, scars) were marked to facilitate reproducibility of count area in the various visits. The duration of the entire study for each subject was up to 7 months.
Hair was shaved and treatment was performed by applying light pressure on the treatment area with the Infinity device, to achieve complete contact with the skin and pressing the trigger button. The applicator was then moved to the next spot without overlap and with full coverage of the treated area. Post-treatment care included the application of cold Aloe Vera cream and a moisturizer cream and the patients were instructed to protect the treated areas from sun exposure and tanning throughout the whole study. After each treatment subjects were instructed to evaluateany adverse event and attend the clinic for its assessment. At each follow-up session subjects were asked to rate their satisfaction level in a scale of four: 0―Not satisfied; 1―Slightly satisfied; 2―Satisfied; 3―Very satisfied.
Sample size was 30 treatment sites of 15 subjects. Hair count p values were performed using paired t-test analysis. Values < 0.001 were regarded statistically significant.
All 15 subjects who enrolled and completed the study were females with an average age of 42 years, with skin type VI that were treated on both axillae for unwanted black hair. Energy levels used (out of 5 levels) were 1 - 3 with a mean value of 2.3.
Results of the clinical study and demographic data are given in
The graphic presentation of hair count and percent hair reduction distribution is given in
Representative photographic illustrations of hair reduction in the two follow-up sessions as compared with baseline photographs are presented in
Subject ID | Axilla | Age | Energy Level | Hair Count per 2 cm2 Mean ± SD | Response | ||
---|---|---|---|---|---|---|---|
Baseline | 1 Month | 3 Months | |||||
1 | Left | 50 | 2 | 47 | 30 | 37 | Slight erythema |
1 | Right | 2 | 49 | 28 | 34 | Slight erythema | |
2 | Left | 28 | 1 | 49 | 19 | 23 | None |
2 | Right | 1 | 49 | 21 | 25 | None | |
3 | Left | 44 | 3 | 55 | 17 | 27 | Slight erythema |
3 | Right | 3 | 53 | 21 | 24 | Slight erythema | |
4 | Left | 25 | 3 | 51 | 18 | 27 | Perifollicular edema |
4 | Right | 3 | 55 | 28 | 30 | Perifollicular edema | |
5 | Left | 59 | 2 | 49 | 26 | 37 | None |
5 | Right | 3 | 47 | 21 | 37 | None | |
6 | Left | 45 | 2 | 48 | 25 | 27 | Perifollicular edema |
6 | Right | 2 | 54 | 26 | 29 | Perifollicular edema | |
7 | Left | 33 | 2 | 50 | 21 | 33 | None |
7 | Right | 2 | 57 | 19 | 31 | None | |
8 | Left | 42 | 1 | 56 | 28 | 28 | None |
8 | Right | 2 | 57 | 30 | 35 | None | |
9 | Left | 21 | 2 | 59 | 27 | 34 | Perifollicular erythema |
9 | Right | 2 | 53 | 27 | 30 | Perifollicular edema | |
10 | Left | 54 | 3 | 53 | 25 | 31 | Perifollicular erythema |
10 | Right | 3 | 55 | 27 | 30 | Perifollicular erythema | |
11 | Left | 55 | 3 | 47 | 17 | 25 | None |
11 | Right | 3 | 50 | 17 | 23 | None | |
12 | Left | 60 | 1 | 55 | 19 | 30 | None |
12 | Right | 1 | 58 | 20 | 23 | None | |
13 | Left | 28 | 2 | 59 | 29 | 37 | None |
13 | Right | 2 | 59 | 25 | 32 | None | |
14 | Left | 32 | 3 | 51 | 17 | 25 | None |
14 | Right | 3 | 50 | 19 | 22 | None | |
15 | Left | 49 | 3 | 57 | 25 | 34 | Perifollicular edema |
15 | Right | 3 | 56 | 21 | 35 | Perifollicular edema | |
Mean Hair Count | 42.1 | 2.3 | 53.4 | 22.8 | 29.7 | ||
SD | 3.93 | 4.37 | 4.78 | ||||
Mean % Hair Reduction | 57.3% | 44.5% | |||||
p-Value | 2.3502E−24 | 5.64221E−20 |
photographs indicate that percent hair reduction after 3 month is smaller than after 1 month.
Subject Satisfaction Score is presented in
No adverse events were noted during the study. Slightedema in the perifollicular sites was experienced by 33.3% of the subjects and resolved within 2 hours. This was a desirable and expected response of treatment endpoint.
The current study demonstrated 57.3% hair reduction 1 month after 6 sessions every other week that was reduced to 44.5% after 3 months and was also demonstrated in the photographs (
Long-term hair removal performed in-office by optical technologies of lasers and IPL have presented an average efficacy of 60% - 80% following a multi-session treatment [
areas after 3 months following 3 treatments was 64%. The three studies were conducted on light skin types, up to Fitzpatrick skin type IV.
In an attempt to adjust the home-use hair removal device to dark skin type (V-VI), lower fluence was applied to the dark skin to ensure safety (energy levels 1 - 3), but efficacy was increased by the simultaneous addition of galvanic energy. Nevertheless, as expected, percent hair reduction was lower than on lighter skin, using a similar device. As the studies described above were conducted with a similar IPL device [
Subject ID | 1 Month FU | 3 Month FU | ||
---|---|---|---|---|
Usability | Outcome | Usability | Outcome | |
1 | 3 | 2 | 3 | 2 |
2 | 3 | 3 | 3 | 3 |
3 | 3 | 3 | 3 | 3 |
4 | 3 | 2 | 3 | 3 |
5 | 3 | 2 | 3 | 3 |
6 | 3 | 1 | 3 | 2 |
7 | 3 | 3 | 3 | 3 |
8 | 3 | 3 | 3 | 3 |
9 | 3 | 3 | 3 | 3 |
10 | 3 | 2 | 3 | 3 |
11 | 3 | 2 | 3 | 3 |
12 | 3 | 3 | 3 | 3 |
13 | 3 | 3 | 3 | 3 |
14 | 3 | 2 | 3 | 3 |
15 | 3 | 3 | 3 | 3 |
Mean | 3.0 | 2.5 | 3.0 | 2.9 |
O = Not Satisfied; 1 = Slightly Satisfied; 2 = Satisfied; 3 = Very Satisfied.
Despite the lower efficacy achieved by the Infinity home-use device on dark skin, when compared to light skin, subject satisfaction was very high. All subjects found the device ergonomic and easy to use. Most of the subjects were very satisfied with the treatments outcome in hair reduction.
In another study [
No adverse events were recorded, like all IPL hair removal home-use devices that were reported to be safe. Some of the devices, however, had impaired efficacy due to safety [
Low-fluence pulsed light combined with galvanic energy, using the novel technology of eHPL™ may be applied safely and effectively for at home hair removal for subjects with dark skin type of V-VI. All patients (100%) showed a reduction in hair removal at 1 and 3 months, with zero adverse effects.
Michael H.Gold,HelaGoren, (2015) The Effect of Novel Low Energy Pulsed Light Combined with Galvanic Energy for Home-Use Hair Removal of Dark Skin. Journal of Cosmetics, Dermatological Sciences and Applications,05,283-290. doi: 10.4236/jcdsa.2015.54034