As per image you sent..
It is not related to/ complications of surgery done two yrs back.
Rather it is looking like some skin infection..
Eczematous changes of psoriasis like picture.
Take tab Allegra 180 mg once daily for symptomatic relief from itching.
Next Steps
Please consult skin specialist for local examination and investigations as required.
Health Tips
Keep your nails clean and short.
Avoid scratching to prevent secondary infection .