appears in the form of itchy transient rash
Treatment with anti histamines
may help her,
But important is to know the cause.
Anything including cloth, vegetables, pollen etc may cause this.
Try to find out the cause and eliminate it.
Ig levels are done to find out a possible immune cause.
Let me know if you have any other doubt.
you can ask a direct question to me on this forum, following the below link.
Wishing you a good health.