Why does the paper strip open up when touched with a charged rod?

When a negative charged rod is brought near, but does not touch, the initially unchanged electroscope shown below, the leaves spring apart (I) . When the electroscope is then touched with a finger, the leaves collapse (II) . When next the finger and finally the rod are removed, the leaves spring apart a second time (III) . The charge on the leaves is

Explaint why, a charged body loses its charge when we touched it with our hand.

Why does your ankle swell up when it is sprained?