Skittzy is a nick-name for schizophrenia. But Skittzy is mostly just very minor hallucinations. Where as schizophrenia at it's highest could be to voices in your head that could lead to killing people. If someone gets Skittzy when they are young it sort of cures itself as the person gets older.
Kaprice thought she was Skittzy after she saw people she had never seen before in her bathroom (if she looked at them they disappeared).