After proper consultation, it can be treated with Internal medicines as well as local application of medicated oil on scalp. This is possible if you previously had hair in that area.
Next Steps
Consult an Ayurveda physician
Health Tips
Don't go for any magical remedy given in newspapers. Include salads and fruits in your diet. Awala powder and Bhringaraj powder combined one spoon empty stomach every morning helps hair growth. Take some Iron supplement along.