The appearance of red marks on the skin upon scratching may be caused by urticaria or allergic dermatitis. First, urticaria caused by allergies is a type of localized edema reaction that occurs due to the dilation and increased permeability of small blood vessels in the skin and mucosa. It manifests as varying-sized wheals, often accompanied by itching and angioedema. Oral administration of anti-allergy drugs such as Chlorpheniramine Maleate Tablets, Loratadine Tablets, and Levocetirizine Dihydrochloride Tablets is recommended, along with external application of Hydrocortisone Butyrate Cream. Second, allergic dermatitis is considered, which is a skin allergic reaction caused by exposure to allergic antigens. It is mainly mediated by IgE-induced type I allergic reactions. Intravenous injection of Compound Glycyrrhizinate Monoammonium is recommended, along with avoidance of spicy and stimulating foods, proper supplementation of trace elements, oral administration of Vitamin C and Vitamin D, and local rinsing with Sodium Bicarbonate Solution.
Urticaria papulosa is a distinctive type of urticaria characterized by bright red papules. The incidence rate is relatively high in spring, summer, and autumn, and it is associated with insect bites. Urticaria papulosa typically presents as brightly colored red papules with small blisters in the center. Sometimes, these blisters are clearly visible with distinct liquid contents. As the erythema and edema gradually resolve, hard papules may remain on the skin, causing intense itching. Acute urticaria is a severe form of the condition, manifesting as varying degrees of brightly colored papules that can be round, elliptical, or of irregular shapes. These papules may appear singly or in clusters, resembling the appearance of an orange peel when clustered together. In addition to skin symptoms, some patients may also experience abdominal pain, diarrhea, and symptoms of asphyxia. The occurrence of this disease is associated with conditions such as systemic lupus erythematosus, rheumatoid arthritis, and dermatomyositis. Angioedema often occurs simultaneously with acute urticaria, particularly in the eyelids and lips. In some cases, there may be sudden swelling with a shiny surface and a severe sense of distension. Urticaria is actually not a single condition but rather comprises various types. When it occurs, the intense itching can be unbearable, and therefore, it is necessary to adopt appropriate relief measures promptly to mitigate the harmful effects on health.
