Uncovering the allergens and clinical symptoms of urticaria

Many common sources of allergies come from common substances in life, but some substances may be difficult to detect. Some experts say that the allergens of urticaria mostly come from food, medicine and external living environment. Especially in the summer, staying in an air-conditioned room for a long time, the probability of allergies continues to rise. The specific allergens that cause urticaria are as follows:

1. Urticaria allergens

1. Pets’ hair, dander, excrement, and parasites. Friends who like pets should keep their pets outdoors as much as possible or avoid raising pets with hair.

2. Dust mites, fabric fibers and dyes are found on carpets, sofas and curtains at home, so you need to vacuum regularly. If you are allergic to dust, do not lay carpets. If you are allergic to a certain fabric or fiber, you should avoid contact. Through the above introduction of experts, we have a certain understanding of the common allergens of urticaria.

2. Clinical manifestations

The basic damage is the appearance of wheals on the skin. The skin often itches first, followed by the appearance of wheals, which are bright red or pale white, skin-colored, and a small number of patients have edematous erythema. The size and shape of the wheals vary, and the onset time is uncertain.

The wheals gradually spread and merge into patches. Due to edema of the dermal papillae, the openings of the epidermal hair follicles can be seen to be sunken. The wheals last from a few minutes to a few hours, and in some cases, they can last for a few days before disappearing without leaving any traces. The rash recurs in batches, and is more common in the evening. The wheals are often generalized or localized. Sometimes they are combined with vascular edema, and occasionally large blisters form on the surface of the wheals.