See the type of itching that you have can be due to two major causes.
Either it is due to an infection ,that is a fungal infection
or it can be due to an eczematous skin condition.
Now the treatment for both of these skin conditions is entirely different, so I would advise you not to self treat yourself.
You might need treatment with either topical steroids
or with topical antifungal
You should see a nearby dermatologist
for proper assessment and treatment.
Dr Geetika Paul