Localized cold-induced urticaria associated with specific immunotherapy for tree pollen allergy

Cold contact urticaria triggered by a permanent tattoo

Cold contact urticaria is an inducible urticaria triggered by exposure to cold air, liquids, or objects. Symptoms may range from mild, localized urticaria to genuine anaphylaxis particularly after extensive contact of large skin areas to cold. Treatment mainly requires a strict avoidance of cold exposure and the use of second-generation H1 antihistamine. In most cases, it is not associated with any specific etiology although in rare cases it can be secondary to various associated diseases or triggered by a number of external factors. We present the observation of a 38-year-old woman for whom cold contact urticaria began on a recent tattoo area.

Effects of high temperature on existing allergic symptoms and the effect modification of allergic history on health outcomes during hot days among adults: An exploratory cross-sectional telephone survey study

OBJECTIVE

The effects of high temperature on existing allergic conditions are unclear. This study explored the prevalence of allergic symptoms and the effects of high temperature on existing allergic symptoms among an adult population. The effects of high temperature on other non-allergic health outcomes were compared between adults with and without a history of allergic symptoms.

METHOD

A cross-sectional telephone survey study was conducted in Hong Kong two weeks after a heat wave in 2017. Socio-demographic information, history of allergic symptoms, non-allergic health symptoms and self-reported changes of allergic symptoms during the study hot period were collected using multiple-choice questions.

RESULTS

Of the 436 respondents, 24% had reported an allergic history. During the study hot period, 22.4% and 15.7% of those who had skin and nasal allergies had reported worsen symptoms comparing to normal days. Comparing to people without an allergic history, those ever having allergic symptoms reported a higher rate of mucus secretions, mouth ulcers, poorer sleeping quality and worsen mood during the study hot period. The main limitation of this study is the lack of baseline information and the changes in symptoms were based on self-report basis.

CONCLUSION

A noticeable proportion of the study adult population reported an allergic history. Some of these symptoms got worse during period of high temperature. Pre-existing allergic symptoms were found associated with more adverse health effects and worse quality of life during hot days. Strategic health promotion policy should be planned to increase the awareness of the potential impacts of high temperature on allergy and the related health issues.