▶ Previous Artlcle: #5-4. Laser in Clinical Medicine 

 

Becker's Nevus

 

Becker’s nevus is a light brown pigmented lesion that develops after puberty and is observed with hair. It usually occurs on the upper arm, upper breast, upper back, and shoulder area.

 

It grows into an irregular shape and becomes over 15-20 cm in size. When the size is large, it can lead to skin cancer, so large Becker’s nevus may require biopsy first.

 

Histologically, acanthosis and papillomatosis are observed, and melanin secretion and melanosomes increased.Treatment is not recommended except for cosmetic purposes, and periodic follow-up is required for sudden changes in the lesion.

 

For treatment, nonablative treatment can be done primarily by using 532nm Q switched Nd:YAG laser, Q switched Ruby laser, long pulsed Alexandrite laser, and Q switched Alexandrite laser.

 

Ablative treatment can also be done with Er:YAG laser and CO2 laser, but it is not recommended. Hair removal should also be performed with the treatment of pigmented lesions.

 

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Nevus spilus 

 

Nevus spilus is a lesion of light brown or yellowish brown spot with black spots of 1-2 mm in size that mainly develops on the body, arms or legs.

 

Histologically, epidermal proliferation such as lentiginesis observed, nevus cells are observed in black spots, and melanin secretion and melanosomes are increased in the basal layer like milk coffee spots.

 

Because melanoma may develop in the black spot, it is followed up without any treatment in principle. However, the brown spot can be treated by using 532nm Q switched Nd:YAG laser, Q switched Ruby laser, and Q switched Alexandrite laser.

 

At the same time, the black spots can be removed by using Er:YAG laser or CO2 laser.

 

- To be continued