You could have debris in the faucet. I would suggest turning off the water to the house. Disassembling the faucet from the hot side. Then turn on the house with the faucet stems gone and blow out some water. If there is anything blocking the faucet, it will be pressurized out the handle barrel. If this is a 2 handle faucet that could be the problem.
If its a single handle, it may be an old style pressure balanced, and you might have to replace the cartridge. Hard to say without the faucet type and model number.
But if your pressure is good in the bathroom sink and every where else in the house. The only thing left is something blocking the faucet.
Like calcium. This will also let you know if there is a problem with water flow to the faucet. Which typically occurs on the hot side.