Pricking nose is a habitual thing. It totally depends upon you as the person like should consciously try to stop this compulsive behavior.
You may please try at home and office asking the family members and colleagues to poke you every time you do this and may help you to come out of this.
If this is not effective, the other way is to consult a Psychiatrist for counselling and management of your habit.
Do not worry about the whiteness, it will get clear on its own once you stop the medicines or you can use some creams as per the advice of your Doctor or a Dermatologist .
Hope this helps you.
These Q&A’s are for educational purposes and should not be relied upon as a substitute for medical advice you may receive from your physician. If you have a medical emergency, please call 911. These answers do not constitute or initiate a patient/doctor relationship.