I would suggest CND Cuticle eraser and CND Solar Oil as a treatment pack ....
Apply this every night....apply a dot of Cuticle eraser and a drop of solar oil to the nail and surrounding skin....wear cotton gloves, then in the morning wash hand and use a soft nail brush to remove any loose debris.... it will soften the skin over a period of time........In nibblers, the skin hardens due to the saliva and skin contact during nibbling.....in non nibblers,during the use of detergents and no rubber gloves....
The body is only doing what it knows to do best and that is to protect and heal itself, this it does by hardening the skin, this pack is a mega conditioning treatment....
If there are sore areas on the surrounding skin, then use the CU3:renew, apply this daily, the copper in this cream will speed up the skins healing process...............
HTH