Use Neem Plant Leaves:
Neem or margosa plant is very important for its ancient use as a medicinal product for curing a number of skin rashes and conditions from ages. According to researches, the neem plant leaves possess a number of antibacterial and antimicrobial properties, thus helping in the combat against the infections that might result as an attack by the bacteria and viruses. The neem plant leaves also have a number of anti-inflammatory properties and helps in reducing the inflammation of the skin at the site of heat rashes. Make the neem plant leaves to powder and mix it with water to make a paste and apply on the skin for reducing the swelling. Try to the left the neem paste on the skin for almost a few minutes and then wash off to have better results. You can also add neem powder in your bathtub in order to kill the infections and better the skin condition due to heat rashes.