Urticaria and angioedema
Urticaria and angioedema are also called wheals and angioneurotic edema. They can occur separately or simultaneously. They manifest as edema of the skin that is not a finger mark, and sometimes involve the upper respiratory tract or gastrointestinal mucosa. Urticaria only damages the surface of the skin, manifesting as a mass rash with red and red edges and a pale center, which sometimes merges into a huge wheal. The lesions of angioedema involve the deep layers of the skin (including subcutaneous tissue), and easily identifiable localized edema occurs. These manifestations can appear and disappear rapidly for a while. Recurrences that do not exceed 6 weeks are acute, and reactions are chronic.