When I started playing 2 months ago my fingers went hard, I Then went away for 1 week since not playing for that 1 week my index has gone soft and won't harden up, i play for at lease 2 hours aday and play 5/6 hour on saturday and sunday but still it won't go hard again.

Any tips as this is doing my head in because after 5 minutes the string won't play properly as its made a grove in my index finger!!