After childbirth, there was a strong smell from the right armpit even …

After childbirth, there was a strong smell from the right armpit even though I washed 3-4 times and used deodorant. Now it smells less. As the warm weather started, there's an additional smell from under the chest. I decided to have some tests done, but all the tests were normal. How can I get rid of this unpleasant odor? I wash 3-4 times a day because I can't stand this unpleasant smell. Maybe someone else has had this experience?