Burn the sickness In your flame;
   Burn the sickness That would maim;
   Burn the illness By your might;
   Burn the illness In your light;
   Heal me of Illness-pain;
   Heal me of All that's bane;
   Heal me and Set me free;
   With my will so Mote it be!

Or, say something like the following while charging the candles:

   I charge you by the powers of the East.
   South, West and North;
   I charge you by the power of the Earth,
   Air, Fire and Water,
   I charge you by the powers of the Sun.
   Moon and Stars:
   To heal me of this disease, its curses and
   its manifestations!
   So mote it be!

(Use whatever set of words seem to be the strongest for you. Either of these chants will work well.)

Set the candle into its holder. Charge the remaining candles individually and place them in their holders. If you use both purple and blue candles, alternate the colors so that no two are beside each other.

Leave the room.

Let the candles flame for at least fifteen minutes.