L50-L54: Urticaria and erythema
The group of conditions referred to as urticaria and erythema fall within the range of skin disorders characterized by red, raised, itchy marks on the skin surface. These conditions primarily occur due to an overactive immune response to a variety of triggers like allergens, heat, cold, pressure, or sunlight. The affected individual typically presents with a sudden rash, often accompanied by a burning or stinging sensation. Urticaria, also known as hives, often appear in clusters with welts that can change shape, move around, disappear, and reappear over short periods. Erythema yields a superficial reddening of the skin, induced by injury or irritation causing dilatation of the blood capillaries. These conditions' progression varies considerably from person to person, with some experiencing brief, isolated incidents, while others may face chronic issues. These conditions primarily affect the integumentary system, which includes the skin and its appendages.
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