Nevus of Ota treatment

Researches » Nevus of Ota treatment

 

 

 
 

 

 

Q-Switched Nd YAG Laser Treatement

for Acquired Bilateral Nevus of Ota-Like Maculae:

A Long Term Follow Up

 

Acquired bilateral Nevus of Ota-like macules is one of the most commonly acquired dermal facial melanocytoses among people with dark skin, especially Asian women. Clinically, the condition is characterized by a cluster of brownish black dermal hyperpigmentation either on both sides of the malar, temple, nasal alar, nasal bridge, or in combination.

Since the only other proven technique to address the pigmentation condition on long term basis is dermabrasion, which is considered invasive with longer recovery period by most, hence the researchers thought of determiningthe efficacy of Q-Switched Nd YAG laser as another method of treatment.

Seventy (70) female patients, aged 25-40 with a mean age of 37 years were enrolled in the study. The lesions were bilaterally located around the malar area for all the patients; 9 of the patients also have simultaneous lesions on other areas such as the temples, the nasal bridge, and the nasal alar. Forty two (42) of the patients have Fitzpatrick Type 3 Skin Tone, 26 have Type 4, while the other 2 have Type 5.

The Q-Switched Nd YAG laser unit used in this study has a wavelength of 1,064nm, pulse width of 25ns, maximum pulse repetition rate of 10Hz, and a maximum energy density of 40 J/cm2 at 2-mm working spot diameter. The laser parameters used in this study has a flatulence of 8-10J/cm2 at 2- or 4-mm spot diameter on a 10Hz repetition rate. The 2nd session was scheduled 2-3 weeks following the first one, then subsequently after that. The number of sessions was determined by total clearance of lesions.

During the treatment, most of the patients experience minimal punctuates bleeding on the treated area. The bleeding increased as higher fluence was used. It was also noted that subjects with darker skin tone had higher tendency of bleeding.

50% of the subjects experienced hyperpigmentation on the 2nd or 3rd week during recovery, these pigmentations however responded readily to hydroquinone cream within a few days. The subjects received 2-5 sessions of laser treatments before complete clearance of the lesions was noted. Of the 70 original subjects, two (2) were lost in follow ups, while the other sixty eight (68) were available for final evaluation 3-4 years post operatively. Along the 68 patients, 49 patients were able to show up for the follow up evaluation while the other 16 only gave feed back by phone call. All lesions were completely removed and no recurrence occurred during the follow up period. Nome of the subjects experienced any change in skin texture or any permanent skin pigmentation.

 

See Paper Abstract here.

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