Carefully clean all surfaces of the ball or flapper and seat with a rag. Inspect for corrosion. Leaks around the outside of the valve seat are exceedingly difficult to detect, are not very common, and are usually minor when they occur. As an alternative, turn off the water, flush the tank, sponge out the remaining water, wipe the seat with a rag, and allow everything to dry throughly. Then seal the perimeter of the seat with silicone caulk.
Large cracks mean a new tank is needed.
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