
This is a common allergic reaction in which itchy red rash or welts appear on skin.
They subside without any scar formation but may recur.
This can appear anywhere in the body and vary in size from small, pimple like spots to raised patches.
Sometimes they disappear immediately but sometimes last for days or even weeks.

Causes
- Allergy is the main cause.
- Allergy can be to certain food e.g. strawberry, fish, etc.,
- certain drugs & medicines, certain environmental pollutants like pollen, smoke, house dust.
- Emotional stress.
- Insect bite and stings.
- Physical agents like heat, cold, sunlight etc..
- Infections due to bacteria, viruses & fungus.
- Certain diseases like lupus.