Hello.

Thanks for the query.

Scabies is quiet unusual to involve only the waist line.

According to me it is could be a fungal infection (tinea cruris). Hydrocortisone might give temporary relief but permanent cure is topical as well as oral anti fungal for atleast a month. Did you also try antifungal agents.

The fungus is very resistant to treatment and hence complete one month treatment is required even if there are no symptoms.

If possible kindly upload few pictures, this will help me in justifying my answer.

Regards

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