Through medical it was possible earlier but now it has already passed 7 yrs...
You can go with Ayurveda treatment like kshara karma... Go and consult your nearby good ayurvedic doctor who do this.
Next Steps
Avoid constipation... Curds,potato, brinjal,.
Health Tips
Maintain good digestive system and according to the system use ghee. Can drink buttermilk daily.. For any query can consult online.