Muscle waste on wrist due to Apple Watch

The watch should not be sitting in an area where there are muscles, but you may have some layer of fat there unless you’re really lean. If the band is persistently too tight it will leave an indentation in the fat layer.

As KiltedTim said, you need to consult with a doctor, as the volunteers on this forum are not qualified to render medical opinions.

You should also consider not wearing the watch until you do speak to a doctor.

You really need to talk to your doctor about this.