Apple Watch 9 causing broken capillaries on wrist

It is my first watch which I purchased for its emergency call capability when I am out walking alone.

I did have it snug but thought it better in order to get a proper heart rate reading which I have wanted to monitor. I researched internet but hard to figure out what "tight" is. It was never uncomfortable, but stayed snug without any movement. I am afraid now to wear it, but would hate to give it up without knowing if one notch down would work without any more damage. All in all, I am no expert but whatever the tech is going here, seems pretty powerful. The burning sensation that preceded the new visable capallaries did feel like a radiation sensation.

Do you think going down a notice where I could almost slide my small finger under would still register a correct heart rate or do you use that feature.

Really appreciate your response.

Not taking any drugs like that. And no rash or external blood, just 3 small dots under my skin which seem to coincide with the round disk like images on backside of watch. A magnifying glass show tiny blood vessels right under the skin which are brand new. I would have noticed as I had been closely inspected my wrist in the first few days for any allergic reaction. Very strange indeed. Will try a looser band and inspect carefully.

Many thanks.

Correction, meant "going down a notch".

Thanks so much, I will do this. It's worth a try before giving up.