Hello, Welcome to Health Care Magic Cocaine is a very addictive substance of abuse. It is a activating substance and causes intense excitement, feeling of euphoria but in the mean time also result in palpitations and anxiety. Common method of intake is snorting the smoke or fumes. Chronic snorting causes nasal crust formation, infection with bacteria especially pseudomonas, depression of nasal bridge, chronic nasal congestion. The greenish crust formation is most probably due to bacterial infection. I would advise you to stop the cocaine use and consult a Psychiatrist for treatment. In most cases to prevent severe withdrawal symptomatic treatment is given. Medicines like benzodiazepines, clonidine etc decreases severe anxiety and relieves pain. Take proper nutrition. For treatment of crusting wash the affected area with normal saline and apply antiseptic solution twice daily for at least a week. With time the infection will resolve. Visit a psychiatrist for treatment. Thanks