Essential oils for the face can be mixed with a high grade toner (1/3 oil to 2/3 toner, or 1:4, or 1:5) and applied to face and/or neck b/4 bedtime after nightly cleansing. For oils with a thicker viscosity (i.e. patchouli, sandalwood),1 drop will go a long way;  oils being used for blemishes may require more drops to do the trick.  The important thing to remember is that our skins are unique;  a formula that works for one person may not work for another even though the issues are the same.  So have fun and experiment until you come up with a formula that works for you.