is a form of urticaria that manifests mainly in areas exposed to prolonged pressure, like the shoulders after carrying a heavy bag, or the soles of feet after standing.
One can also get itchy lumps ('urticaria') without any pressure that is termed as idiopathic spontaneous urticaria.
is a non-sedating antihistamine but can cause drowsiness
in about 10% of people. so the better option would be Allegra
180mg once daily (maximum 180 morning and 90mg at night) for 3 months that can be stopped if you have not had a single eruption.
It is a difficult form of urticaria and only 5% of people have this for over 10 years despite maximal treatment.
Hope this helps.