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Background: Irritant contact dermatitis (ICD) is a localized, nonimmune-induced inflammatory skin reaction, characterized by multiform skin lesions, including erythema, scaling, edema, blisters, and erosion. Mercury and its related compounds are highly allergic agents that can induce allergic contact dermatitis., Aims: This article aims to clarify the skin damage caused by irritant contact dermatitis caused by the addition of high doses of mercury to skin care products., Patients: A 30-year-old female patient sought treatment at our Institute for contact dermatitis., Results: Through the patch test of the patients and the component detection of the skin care products her use. A large amount of mercury was found in skin care products, and the patient had no apparent allergic reaction to mercury., Conclusions: We considered irritant contact dermatitis caused by excess mercury, and the patient's condition improved with treatment., (© 2022 Wiley Periodicals LLC.)

Background: Rosacea is a common chronic inflammatory dermatosis with uncertainty of etiology. Although clinical features and risk factors of the disease in Caucasians have been reported, this information in Chinese is largely unavailable., Aims: To analyze the clinical features and associated risk factors of rosacea in Chinese., Methods: A questionnaire was given to outpatients with rosacea who visited the dermatology department of the first affiliated hospital of Kunming Medical University from June 2018 to March 2019. Analyses included demographic characteristics of subjects, clinical characteristics, and risk factors of rosacea., Results: A total of 254 outpatients completed the questionnaire. The ratio of female to male was 5.68:1.00. The mean age at onset was 31.18 ± 10.23 years. Erythematotelangiectatic subtype accounted for 51.60%, while 39% of the subjects were of papulopustular subtype. The rest were phymatous type (9.40%). Subjects with flushing, persistent facial erythema, and telangiectasia accounted for 91.73%, 90.55%, and 83.07%, respectively. One hundred and thirteen subjects (44.49%) had papules or pustules, and 24 subjects (9.40%) were with phymatous changes. The most commonly involved sites were the cheeks (93.31%), followed by the nose (82.68%), the perioral area (61.42%), and the forehead (51.97%). The clinical symptoms included burning (93.70%), dryness (90.55%), and itching (75.59%). The main risk factors were sun exposure (90.94%), temperature change (87.40%), etc. Fifty-one (20.08%) patients had comorbidities., Conclusions: Rosacea mainly affects young females. The common signs and symptoms include flushing, persistent facial erythema, and burning. Sun exposure and temperature changes are the common risk factors. Patients can have comorbidities of systemic disorders., (© 2021 Wiley Periodicals LLC.)