Hi, thanks for your query.
The itching in your case is due to dermatomyositis
or simply xerosis.
For this you may do as follows:
-Keep your body well hydrated by applying emollients twice or thrice a day.
-Don't scratch the area as it initiates scratch-itch cycle which which will further increase the intensity of itching.
-You may take oral anti histamines
for itching on a regular basis for 10 -15 days by consulting with your dermatologist
You may get examined by a dermatologist to rule out other coexisting cause of itching.
Hope this helps you.