What is the reason for skin itching and catching a red one?

Urticaria is the most common disease that causes skin itching clinically. Urticaria can be manifested as skin itching, scratching can cause extensive redness of the skin, some patients skin redness lasts for a long time, if no longer irritate the skin, can also resolve on its own. Urticaria causes are very complex, such as physical, chemical, drug or infectious factors can cause urticaria. In addition, if the above causes are excluded, oral antihistamines such as loratadine and cetirizine, once a day, can be well controlled.