will "growth and decay" passive increases the self inflicted damage?

This passive says
http://pathofexile.gamepedia.com/Growth_and_Decay

"

20% increased Damage over Time
1% of Life Regenerated per second

If I use Righteous Fire, Will it increase the self-inflicted damage?

I mean, If I choose this passive, Will I take more damage?

No, RF has two parts, buff and damage. Self degen belongs to the buff part so it won't be affected by bonuses that affect your damage output, before 2.0 you'd need to watch for 'buff effect' passives but that's found only on a few uniques now.