It's more likely than not fo. Take the tee tiny pinch corner of your pinky and wisp it to the edge of a drop. Put the tip of your tongue to it. It will probably zap in my experience, but will be telling in if it tastes like the fo smells, it's fragrance and will be reabsorbed. I just had this happen today. A tiny pool atop my newly made soap and I barely dipped a pinky in it at the very edge, zap tested the finger, and it zapped strong. I was careful, however, not to get too much and it didn't burn my tongue nor my finger (seeing as I washed it immediately).
Hours later it reabsorbed and the zap in the same spot was completely gone. Seeing as how lye reacts with oils to saponify, and fo leaked, it's feasable lye water leaked as well as the fo leaked..but once reabsorbed the lye has the opportunity to continue its saponofication once it is interacting with the oils again. So long as you dissolved the lye completely and didn't use too much, it will be fine once reabsorbed.
If you're too frightened to attempt a pinky zap test, wait 24 hours and zap the spot the liquid was (assuming it reabsorbed).
