urticaria
URTICARIA
Urticaria is characterized by sudden appearance of wheals and/or angioedema.
The intensity of the pruritus varies but may be severe enough to disrupt sleep, work or school.
It is classified acute if the urticaria has been present for <6 weeks and chronic if >6 weeks. A specific cause is more likely to be identified in acute cases.
It can be triggered by immunological or nonimmunological mechanism.

Introduction

  • Urticaria usually affects the epidermis and upper layer of the dermis
  • It is mediated by mast cells to cause the release of multiple vasodilatory mediators locally, including histamine
  • Characterized by sudden appearance of wheals &/or angioedema
  • Intensity of pruritus varies but may be severe enough to disrupt sleep, work or school
Editor's Recommendations
Most Read Articles
15 Jan 2018
Body surface area (BSA) affected by psoriasis can be measured to target diabetes prevention efforts for patients with psoriasis, a recent study suggests.
Pearl Toh, 14 Apr 2018
Taking the oral extract product of the fern Polypodium leucotomos (PLE) on top of the standard topical hydroquinone cream and sunscreen reduces the severity of melasma to a greater extent compared with the standard treatment alone in Asian patients, a pilot study has shown.
Jan Welch, 01 Jun 2011

Sexually transmitted infections (STIs) are common, with rates of many infections increas­ing over the last two decades.1 Community screening studies in the UK have shown a prevalence of about 10% for chlamydial infection2 and (among women screened in an urban setting) 3% for gonorrhoea.3 In women (Figure 1), these potentially serious infections are often asymptomatic, whereas the presence of symptoms such as vaginal discharge generally indicates a less pathogenic (but still potentially debilitating) infection, with an organism such as Candida. STIs are often multiple, and the finding of one infection should prompt consider­ation of testing for others. Many sexual health services now initially provide screening tests for asymptomatic women, but a more comprehensive assessment—comprising detailed history4 and genital examination5—is usually necessary when symptoms are present.

Stephen Padilla, 5 days ago
High use of hydrochlorothiazide (HCTZ) appears to significantly increase the risk of nonmelanoma skin cancer (NMSC), particularly squamous cell carcinoma (SCC), suggests a recent study. Use of other diuretic and antihypertensive medications does not appear to be linked to NMSC.