Hi, thanks for posting your query
I think you need to start oral antifungal
150mg once a week in addition to local application of anti fungal creams like terbinafine
. you may need to take the treatment for 3 months or even more.
get a fasting blood sugar done to rule out diabetes (Infections are prolonged in diabetes)
For itching you may take anti histaminic like cetrizine as and when needed.avoid scratching as it disrups skin continuity and there are chances of secondary bacterial infection
hope this helps you