Urticaria (hives) is a skin rash presenting as an itchy red rash or lumps called weals. Depending on the trigger, hives can last in duration from a few hours to a week.

Acute urticaria is urticaria (hives) that is present for less than six weeks. It is characterised by weals and sometimes angioedema, and resolves within hours to days.

Images of urticaria, angioedema (hives). Authoritative facts about the skin from DermNet New Zealand.

How is the diagnosis made? Cold urticaria can be diagnosed by applying an ice cube against the skin of the forearm for 1–5 minutes. A distinct red swollen rash should develop within minutes in the area …

Apr 4, 2019 · What is urticaria in children? Urticaria refers to a group of conditions in which weals (hives) or angioedema (swelling) develop in the skin. It is very common in children. A weal is a superficial …

Autoimmune progesterone dermatitis Autoimmune progesterone dermatitis is a rare, recurrent and itchy rash affecting women during their childbearing years. Skin lesions appear during the second half of …

Mycoplasma pneumoniae is a bacterial organism that can cause respiratory tract infections. In many cases, infection due to M. pneumoniae is asymptomatic or results in non-specific symptoms. …

Solar urticaria is a rare form of chronic inducible urticaria (hives) in which the skin swells within minutes of exposure to natural sunlight or an artificial light source emitting ultraviolet radiation.

May 23, 2018 · What is chronic urticaria? Chronic urticaria is the daily or episodic occurrence of weals, angioedema, or both, for 6 weeks or more. Chronic urticaria can persist for 1–5 years, sometimes …

Cholinergic urticaria (heat bumps) is characterised by short-lived hives that occur due to sweating. Stimuli that can cause excessive sweating include exercise, spicy food ingestion, and emotional stress.