I see a light brown stain spreading along the side of my temple. What should I check before the laser consultation?

For some time now, whenever I tie my hair up, I notice a wide, light brown patch spreading from the side of my temple to above my cheekbone. It isn't a distinct blemish like a mole; the edges are blurred and spread out, so it looks patchy even when I cover it with makeup. It also appears particularly dark when the afternoon sunlight shines from the side. I wondered if the cause was that the side of my face was exposed to sunlight even when I wore a hat during the summer. Since it is late autumn and the UV rays have weakened, I am planning to seek a consultation. However, because this area is close to my hair and the skin is on the thinner side, I am unsure what to check first.

1. When consulting about brown spots with blurred borders, should they be considered melasma or blemishes?

2. I am wondering if the laser intensity or interval is set differently for areas with thin skin, such as the temples.

3. Since this area is close to the hair, how should I manage hair products or dyeing before and after the treatment?

4. I would also like to know what methods I should take care of in my daily routine for sun protection on the sides of my face.

The photo attached below the text is to show you a reference of what my skin looks like.