I would suggest the following:
a. Keep the area clean and dry. Wear a sports bra ( preferably made of a material that lets your skin breathe) the next time round.
b. Apply calamine
lotion and ice on the affected area.
c. If you have any itching, you can take tablet benadryl
1 tablet at night. For the day time, you can tablet cetrizine
1 tablet daily.
d. Use any powder to keep this area dry.
This would resolve in about a week's time.
Hope this helps.