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All delta faucets have spring-loaded washers that wear out with use
and hence need replacement. When you remove the handle, you will see
a (most-likely hand-tightened) nut which you need to unscrew to remove
the handle stem. Now you will see the spring-loaded washer which you
can fish out using a small screwdriver or the like. Replacement cost:
@ $3 for TWO washers (cold and hot sides). Make sure you turn off the
water before you embark on the project!

Mine are more cups than washers. Be sure to note whether the open side is up
or down and reinstall the same way. Also scrape the crud and buildup off the
bottom of the plastic cartridge that presses against the cup. Be sure to use
something soft so not to damage it. If you do, you'll need to replace it
too-- only a few bucks. If the fixture is real old, might be worth doing a
preemptive replacement on the cartridges as long as you're going to take it
apart.