Thanks for the query.
Yes the combination you mentioned is much better than clobetasol
This hyper pigmentation can be removed by using skin lightening creams.
Various creams are available like melalite xl, lookbrite, Lumaglow etc.
You can take any of them.
The following should be procedure to use it.
1. Wash the affected area in evening around 7.
2. Dry and apply cream all over the affected area.
3. Keep it for one hour.
4. Wash again.
5. Apply some moisturising cream and sleep.
6. In morning apply a sunscreen with spf at least 30.
Do this for a month, you will see the results.
Let me know if you have any other doubts.