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Pigmented Lesions

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Overview
Patients usually want to have benign pigmented skin defects removed for aesthetic reasons. The ideal treatment must therefore be effective and at the same time not cause any cicatricial or permanent dyschromic effects. Bearing this in mind, the use of the very latest laser or pulsed light systems is the ideal method for the removal of numerous pigmented lesions. As a result of ongoing technological research and development, DEKA, always a leader in the laser and pulsed light sector, has devised specific systems for different wavelengths and pulse durations that can selectively target and destroy the melanin contained in pigmented lesions.

Pigmented lesions can be classed as epidermal, dermal and mixed, depending on the location of the pigment in the skin.

The superficial epidermal lesions (freckles, ephelids, milk-coffee stains, several types of nevi and sun spots), are the easiest to remove without any scarring. They can be effectively treated using relatively short wavelengths such as the Nd:YAG duplicated in frequency (532 nm) or pulsed light by selecting the most suitable filter in relation to the skin phototype (5 filters are available with spectra ranging from 500-1200nm to 650-1200nm).

Dermal lesions found deeper down (Nevi of Ota, Nevi of Ito and Hori, and Mongolian spots), require a wavelength of 1064 nm for greater penetration into the skin.

In the case of mixed dermal-epidermal lesions it is advisable to treat the epidermal component first and once this has been mitigated, the laser can then be used to penetrate deeper into the dermal component.

Thanks to the versatility of DEKA's pulsed lights and Q-switched laser technology with two wavelengths (532nm and 1064nm), a system for selectively targeting the melanin at different depths in an efficacious and non-invasive manner has been developed.

Finally, to eliminate superficial epidermal lesions, it is also possible to use fractional micro-ablative systems (such as the SmartXide DOT CO2 laser system) and non-fractional systems (like the Er:YAG Smart 2940 Plus).

 

How it works

Melanin, which is the main chromophore of hyper-pigmentation, accumulates in the melanosomes. Depending on the position of the pigment in the skin, different wavelengths are used with varying penetration capacities

The Q-switched laser systems release high energy at very short intervals (in the range of nanoseconds) which means the melanosomes are selectively destroyed thanks to both a thermal and photomechanical effect. The disaggregation of the melanosomes is always accompanied by the death of the cells that contain them (melanocytes or keratinocytes).

Following the treatment, the deep pigment is eliminated by means of the phagocytary cells, while the more superficial pigment is eliminated transepidermally.

Pulsed light has proved to be an extremely effective and versatile instrument for pigmentary rejuvenation, carried out in total safety. It is particularly suitable for treating sun spots and superficial age spots, especially where the skin is thin and delicate such as on the hands or throat. Excellent results can be achieved in just a few patient-friendly sessions.