boy, kid nibbles and bites a nail on his hand, close-up, the concept of psychological disorder, stress, bad childhood habits

abuse aggression anxiety attention bad bite bites boy burrs childhood close compulsive concept deficit disorder expression face fingernail germs habit habits hand hands his hygiene hyperactivity kid lost manicure mental nail nails nervous nibbles obsessive obsessivecompulsive pressure psychological psychology sad scared stop stress stressed stressful syndrome tension terror test unhappy upset worms