Hello,
You can check if you have been doing any of the few following things since last few days:
1.Have you suddenly switched to hot water or cold water which you wouldn't do before.
2. Have you started using some new shampoo or soap or body wash or any new product for that matter.
3.Any new diet has been added in last few days.
4.Any new clothes were tried on.
5. Any history of fever or other symptom associated?
Next Steps
Try applying cold lactocalamine twice a day and check for the above history.
Health Tips
If the issue increases at any point of time or you have new symptoms or you see any rashes you must immediately contact a dermatologist.
Hope this helps:)