Nevus

Conception

It is congenital light brown patch-like pigmentation. No extension in adulthood. There are some brown or dark brown papillas on the patch.

Clinical feature

1. It's occurred in the infant period or born.
2. Occur to any part of the body, Most of them happen on trunk, asymmetric.
3. Different size, clear bound papilla scatter on the CALMS (Few mm or tens of mm in diameter)
4. Extend rapidly in adolescence, no longer worse during adulthood;

Histopathology

The total amount of melanin in the epidermis increases and the amount of melanocyte increases.

Method of treatment

Single pulse 400mj Q-Switched ND:YAG laser and Ultra Pulse CO2 laser.