Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concern..
As per your complain there is a possibility that you are getting
allergic reaction to something that you are coming in contact with and as soon as you are exposed to the allergen there can be symptoms of allergy like Itching..
There does not seems allergic reaction to sweat but in case if cleanliness is not maintained there can be proliferation of bacteria and other infectious organisms leading to inflammation causing burning and itching..
I would suggest you to maintain cleanliness and you can also take anti-allergics like
Benadryl to relieve the symptoms..
Try to change the washing powder and see for results..
You can apply
Calamine lotion as well as
steroid ointment to soothe the skin..
In case if there are consistent recurring episodes
consult a dermatologist when the symptoms are active and get evaluated..
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora..