5-6 strands of grey at 21, im worried!

From the past year, I’ve been noticing 3 strands of white hair on the right side of my head (top), and recently, about a month ago, got 2-3 more on my left, same position.

I have had iron deficiency in the past, and a slight b12. But it is under control. I do take stress, but it’s never long term (i have health anxiety). My genetics are not an issue here, both my parents got gray hair in 30s.

Do I consider going to derma? Is it normal to have a couple pieces at the top of your head, this young?

Any tips on reversing? Can sun exposure be the reason?