Hyperpigmentation Treatment

I used castor oil (cold pressed cold processed) [to get rid of hyperpigmentation]. Place a cotton swab cut to size to fit my scar on my leg. Soaked the cotton swab in the castor oil. Placed the swab on my scar and wrapped my leg with saran wrap to hold the cotton swab in place. Placed a hot rag in a bag instead of a heating pad and played in on the wrapped scar for 20mins nightly. Sometimes I wore pants and kept my leg wrapped with the soaked swab all day. Only removing for baths.. I noticed my skin color returning to normal after 2 weeks and now it 50% back to normal after 5 mths.