Drip problem...help please

All fixed............. Luckily.

With enamel I would wait at LEAST 48 hours to sand that drip, as the paint is thicker there it will take longer than the body to harden and cure... otherwise you might get to the tootsie pop middle in the course of sanding it (the still mushy paint)  That's the only way I would know to correct the problem.  You might try using a nail sanding board to work at just the raised area of the drip first until it gets close to being flush with the body.  With a regular sheet of sandpaper I would worry about hitting the area surrounding the drop a few too many times and creating a low spot around that area.