Lay a drop cloth on the floor and move any furniture away from the area you will be painting.
Use a broom and a ladder to remove any cobwebs, dust or dirt from the ceiling.
Pour a stain-block primer into a paint tray and use a telescoping roller to cover the stain. Paint at least 4 inches beyond the stain. Let the primer dry according to the manufacturer's directions. If needed, apply a second coat of primer.
Rinse and dry the paint try and roller.
Pour ceiling paint into the paint tray in a color that matches the surrounding ceiling color.
Roll the paint onto the stain and allow it to dry according to the manufacturer's directions. If needed, apply a second coat of paint.