Prime with a stain blocker like Kilz and paint.
A prime with stain blocker first then you should add 2 layers of paint over the surface
Thin some bleach with water and lightly dab the stain. Do find the source of the leak first though and resolve that.
Thanks for your reply. We have taken care of the roof. I was hoping for a solution that wouldn't require painting because I was concerned matching the paint. Wish me luck, L Mac