Leaky bathroom faucet - can't find screw on handle
grab the round base right below the handle that turns the water on and twist ccw to   unscrew the faucet. this is a moen faucet. however, I have the same faucet in my bathroom. I called moen for parts and they said that most parts are not available since they discontinued production of this faucet. iF YOU ARE THE ORIGINAL OWNER of the faucet and can prove it they will send you a new faucet at no charge if the parts needed are not available.