Acute Urticaria: It is the most common type of Hives where symptoms lasts less than 6 weeks. It is mostly caused by certain food, insect bite, medicines or insect bite.
Chronic Urticaria: If Hives continues for more than 6 weeks or reoccur frequently for months to year, then it is called as chronic urticaria. Exact cause is not known but disturbed immune system may cause chronic urticaria. Chronic urticaria can affects patients quality of life & have to be dependent on medication such as anti-histamine or steroids.
Dermatographism: It appears when your skin gets scratched. Hives appear in linear form. Symptoms remains for 30 minutes. In rare cases it remains for day or longer.
Angioedema: When swelling occurs in deeper layers of skin it is called as angioedema. Swelling appears around eys, lips, genitals, hands or feet. Swelling may last longer than skin hives. When swelling occur on wind pipe or lungs patient faces difficulty in breathing. In some cases, it may be life threatening & need immediate medical attention.