Question

question 9 (1 point)
how is nevus like vitiligo?
o a nevus and vitiligo are both skin pigment disorders.
o b nevus and vitiligo are both skin disorders caused by cumulative sun exposure.
o c nevus and vitiligo are both skin disorders that result from repeated pressure or friction on the skin.
o d nevus and vitiligo are both skin disorders caused by damage to the skin surface, such as a burn or a scar.

Explanation:

Nevus is a congenital skin condition related to pigmentation (like moles which involve melanin - containing cells). Vitiligo is an acquired disorder where melanocytes (pigment - producing cells) are destroyed, leading to depigmented patches. Both are about skin pigment.
Sun exposure is not the cause for nevus (it's congenital in most cases), repeated pressure/friction is more related to conditions like corns/calluses, and damage to skin surface (burns/scars) cause post - inflammatory pigmentary changes which are different from the fundamental nature of nevus and vitiligo.

Answer:

A. Nevus and vitiligo are both skin pigment disorders.