Hello
You need to find out about the source of allergies. It can be any dietary food, recent cosmetic or change in brand of soap. It can also be from some new clothes.
First of all you have to make sure thats its allergy not an infection like scabies etc. Secondly you have to find out the culprit allergen.
Next Steps
you should first take an antiallergic medicine liek leveceterizine once at night along with some skin soothing ointment like lactocalamine lotion for application on your skin.
you can also get an allergy test done to find out the exact cause.
Health Tips
leveceterizine can cause drowsyness and you will need to exercise caution while driving.
In case you experience any breathing difficulty or if the allergy is increasing you need to show to a doctor.