Tea tree oil
For the people who are experiencing armpit rashes due to alopecia, psoriasis, eczema or fungal infections, tea tree oil is the best cure.
Mix 5-6 drops of tea tree oil with 1 spoon of olive oil. After you clean the area with water, apply this mixture. Wait for 10 minutes and rinse with cold water. Repeat this 2 or 3 times a day.