Now a days these type of itch don't respond to common medications such as creams and powder. These type of itch are modified due to application of various combination creams which are easily available in market, that makes this itch more aggressive after somedays. All these wrong practices makes the actual treatment course prolonged.
Next Steps
do consult a qualified dermatologist doctor to get proper treatment.
Health Tips
don't apply any over the counter creams or dettol which may irritate your skin further.