Options for topical formulation include:
* Cream – Emulsion of oil and water in approximately equal proportions.  Penetrates stratum corneum outer layers of skin well.
* Ointment – Combines oil (80%) and water (20%). Effective barrier against moisture loss.
* Gel – Liquefies upon contact with the skin.
* Paste – Combines three agents – oil, water, and powder; an ointment in which a powder is suspended.
* Powder – A finely subdivided solid substance.