Hey there AnthonyD99,
Thanks for reaching out to Apple Support Communities. I understand you have some spots on the bottom of your Apple Watch. I’ll be happy to help with this.
You can try to clean these spots from your Apple Watch. Go through the following link for steps on how to clean your watch:
How to clean your Apple Watch
If these won’t go away with those steps, it may be from a scratch but it’s hard to tell. If you’d like it further inspected, you can reach out to Apple Support at the following link to have it inspected at an Apple Store or Authorized Service Provider. You can use this link to reach out to them:
Contact Apple Support
Take care.