Is the chicken pox scars on a baby created from scratching?

Damage by infection: The lesions associated with chicken pox do itch, and scratching per se does not cause scarring, but can lead to superficial infection brought to the skin by baby's fingernails (from nose and mouth, which are chock-full of bacteria). The lesions that become bacteria-contaminated often have deeper skin damage, and that is what leads to the scarring-it's all about depth of injury, just like burns!

Poorly healing wound: Scars are inevitable with nearly any wound that breaks the skin surface. Scarring will depend on the depth of the wound as well as the amount of time it takes to heal. The viral infection may cause blisters that can heal with minimal scarring if left closed or intact. Itching will open the wounds to the air and result in delayed or poor wound healing that leaves the typical pox scar depression.