I have a very dry scaly patch of skin under both of my arms, it is also very sore. I have tried lots of things but nothing seems to be working. I have stopped using deodorant and have been using baby powder . It seems to be the only thing that doesn t irritate it further. But if i sweat it becomes more red and more painful. I have not switched to any new detergent, deodorant, or soap. What could it be and how can i get it to go away?
Do not use Deodorant in both arm pit. Washed both arm pit with tap water & allow opening for Chat Doctor.  It will heal with in few days. There is no requirement to anything apply. If not so then you consult dermatologist.