Due to exercise you get perspiration.
Due to perspiration,you get fungal most probably candidal infection.
And so the severe ithching.
Sprinkle anti fungal powder before going to jogging.
Apply antifungal cream like clotrimazole
Take antifungal tablet like ketoconazole
for 1 to 2 weeks.
You will be alright.
If needed, you may consult dermatologist
Dr. Ilyas Patel MD