thanks for contacting HCM,
you are suffering from acute
urticaria.
Acute urticaria is a condition where an itchy
rash suddenly develops. The rash may be triggered by an
allergy, or by another factor such as heat or exercise. In most cases the rash lasts 24-48 hours and is not serious.
The rash usually appears suddenly and can affect any area of skin. Small raised areas called weals (or wheals) develop on the skin.
Food allergies such as allergies to nuts, strawberries, citrus fruit, egg, food additives, spices, chocolate, or shellfish can cause urticaria.
sometimes viral infection or contact with allergens can cause it.
Calamine lotion or menthol 1% in aqueous cream can help with itching. you can increase the dose of
allegra 180mg upto 4 times to control itching.
hope this will help you.
regards