Tài liệu Báo cáo y học: "980 nm diode lasers in oral and facial practice: current state of the science and ar

Benign facial lesions both pigmented (keratoses, melanoses) and vascular (angiomas, linear telangiectases) are very frequent, and affect many adults of either sex with fair complexions [1,2]. Keratoses are circumscribed scaly lesions, lo-cated in the epidermis and composed of a proliferation of pigmented keratinocytes. Yellow-brown in colour, they range from dark yellow to black and can be divided into:
ã seborrheic keratoses, with internal horny pseudocysts
ã actinic or senile keratoses that develop in areas exposed to the sun. Melanosis or hyperchromias are circumscribed pigmented lesions, with extracellular melanin pigment. They can be epidermal, dermal or mixed.