Probably need to remove and replace the cartridge. Often sediment will tear part of the o-ring or seal on the cartridge and cause this problem...
varies by model, but generally, remove the cap on the knob, unscrew the knob, remove the keyed sleeve, remove the round trim plate & shut off the service stops (verify they are fully closed by pulling out on the valve stem) next remove the retaining clip (needle nose and be gentle) that holds the cartridge in place, then pull the cartridge straight out with vice grips or similar (or get a puller). clean the cartridge, flush out the valve body by slightly opening both service stops, reinstall cartridge and clip, open service stops and see if it still leaks. if it does, take your cartridge to the store (any reasonable HW or plumbing store should have a replacement) and get a new one. then reverse the process to reinstall.
If you send me the model I'll get you more specific instrucitons and pictures...
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