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Itching in the groins due to excess sweating indicates fungal infection
called TINEA CRURIS
You need to take antifungal medicines like fluconazole
or terbinafin for best result .It should be taken for at-least 4 weeks along with topical anti fungal creams & powder.
Try to keep the area dry with the help of anti fungal powder.
If you are getting recurrent problem then kindly check your blood sugar level.You should consult a dermatologist
for proper prescription.