Sore, purple bruised big toe to the bottom/side. Now white spots appeared in the centre. Really painful & can't walk properly. Do exercise regularly.?

Down under the toe. It sounds as though you've managed to injure the toe. Bruising is a sign of underlying tissue damage and steps should be taken to minimize further damage. Exercising should be eliminated until the effects of the injury are under control. Ice compression, elevation and rest are the mainstays of treatment. To remove all doubt, have the toe x-rayed and examined to assess the degree of injury.