We are on a well with inside large accumulator. Water pressure at all the other outlets is great. The master bathroom is constantly changing, never a strong flow and both hot and cold (individual facets) pressure will always be the same.

Is this a sink or tub faucet? If a sink, make sure the aerator is clean. If a tub, you may have some debris in the cartridge(S).

As stated above: remove aerator ( the screen attachment on the tip of the faucet ), run water without it, clean aerator, reinstall.

Sometimes, aerators are hard to clean as small particles are embedded in the small passages of the filter screen. Then I would get new aerator. There are inexpensive, under $3.00. You can purchase new one in HD or Lowe's, or any other plumbing supply store. Don't forget to take the old one with you to make sure you are getting the correct size aerator.

Hope that helps

Milo