Thanks for posting your query.
when applied locally are not absorbed much to cause any systemic levels of importance, but 17years is a very long duration.
The skin may have local effects of steroids like degeneration of dermis
and subcutaneous tissues.
The skin can get thinner and may look glowing due to decreasing connective tissues underneath but is is harmful for the skin health.
You should apply curd and lemon juice once a day for about a week. And off-course you should stop the steroid application.
Hope I have answered your query.
If you have any questions I will be happy to answer.