Thanks for the query.
There are different ways of doing that and it differs from patient to patient. If you have tried medical therapy and have not achieved desired results, you can consider surgical options like suction blister grafts/non cultured melanocytes suspension. It requires expertise to perform and results take few months to be visible. Most of the patients do well if they stick to the recommendations.
Next Steps
Your dermatologist will decide a treatment plan for you after a consultation.
Health Tips
Avoid Self Medications. You can consult me separately on the follow up messages to learn more about this