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Erythema multiforme (EM) is an immune-mediated inflammatory skin condition associated with several viral infections, that appears with red patches evolving into target lesions, typically on both hands.
Chronic urticaria is usually seen in those older than 40 years, it is more common in women. [4] The prevalence of chronic urticaria is 0.23% in the United States. [4] Notable risk factors associated with an increased risk of chronic urticaria include allergic rhinitis, asthma, atopic dermatitis, and autoimmune thyroid disorders. [53]
Chronic spontaneous urticaria, despite its cause being unknown, is linked to a higher prevalence of autoimmune diseases, and is often worsened by triggers like stress, infections, certain foods, or nonsteroidal anti-inflammatory drugs. The hives and angioedema seen in CSU is thought to be linked to the degranulation of skin mast cells.
It encompasses a spectrum of three clinically overlapping autoinflammatory syndromes including familial cold autoinflammatory syndrome (FCAS, formerly termed familial cold-induced urticaria), the Muckle–Wells syndrome (MWS), and neonatal-onset multisystem inflammatory disease (NOMID, also called chronic infantile neurologic cutaneous and ...
Many inflammatory factors have been detected in erythema toxicum neonatorum lesions, including IL-1alpha, IL-1beta, IL-8, and eotaxin. [5] [4] These molecules cause redness and swelling in the skin and attract immune cells. [10] Eosinophils and other immune cells are found in the upper layer of the skin in erythema toxicum neonatorum lesions.
Physical urticaria is a distinct subgroup of urticaria (hives) that are induced by an exogenous physical stimulus rather than occurring spontaneously. [1] There are seven subcategories that are recognized as independent diseases. [2] [3] Physical urticaria is known to be painful, itchy and physically unappealing; it can recur for months to ...
Serum sickness in humans is a reaction to proteins in antiserum derived from a non-human animal source, occurring 5–10 days after exposure. Symptoms often include a rash, joint pain, fever, and lymphadenopathy.
[3] [4] Risk factors include HIV/AIDS and systemic lupus erythematosus. [2] Diagnosis is based on a skin biopsy and involvement of more than 30% of the skin. [3] TEN is a type of severe cutaneous adverse reactions (SCARs), together with SJS, a SJS/TEN, and drug reaction with eosinophilia and systemic symptoms. [5]