It is better to take steroid rather than trying home remedies if it is widely spread. But of course to sooth the rash and to get relieve from itching try below home remedies:
- Apply calamine lotion.
- Place cool, wet compresses on the affected area for 15 to 20 minutes several times a day.
- Soak yourself in a cool-water bath containing an oatmeal-based bath product like Aveeno.