20 y/o with a bald spot should i be concerned about it, or is it normal?

[Nick5657]

I've had this bald spot for atleast 4 years, probably longer (currently 20, first noticed when i was 16). I never used to care though, but recently i've started to worry about it.

This was the bald spot at 17:

https://i.imgur.com/D8FtV1r.png

Here's a few i took a few minutes ago:

https://i.imgur.com/8KqGaJ7.png

https://i.imgur.com/FGBbqGX.jpg

https://i.imgur.com/JovIMnx.jpg

For the moment my hairline seems to be fine (hopefully that doesn't change).

https://i.imgur.com/kvYM1Xd.png

Is this something i should be more worried about? I've been using Regaine on the spot for about a couple months now, but haven't noticed much change (to be fair it does say to wait 4+ months). Should i be looking at other treatments, or do you think just stick with Regaine for the moment and see if it gets any better / worse before deciding what to do next?

Thanks.