This is limited details and more precise information is needed about your skin condition which can help in planning a treatment. A thorough history, clinical examination and appropriate laboratory tests will be needed to solve the mystery. A photograph would have been helpful. Consider seeing a Dermatologist for proper diagnosis and treatment plan. Diagnosis should be reconfirmed by meeting a dermatologist in person, It is rare for scabies to persist even after a treatment.
Your dermatologist will decide a treatment plan for you after a consultation.