How does Cursed Doll affect support classes?

I just got luck with my bard and got an ability stone with the 3rd Vitality bonus, +7 Awakening but +6 Cursed Doll.

How does Cursed Doll will affect my heals, does it only affect me with the -25% bonus or I’ll heal others 25% less too?

It should only be applicable to heals to yourself.

However, you should ditch that stone as soon as possible when an opportunity presents itself.