Hard to say...: ...But a possibility that comes to mind is a chemical reaction between the soap that you washed with and some substance ( a cream, medicine, or cosmetic) that was already on your face. If it was caused by just the soap, then everywhere the soap touched your skin would be green. Since it's only green on your face, it's reacting with something that is only on your face.
Answered 8/3/2013
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