shellac and Dermatitis--Allergic-Contact

Topics: Allergens; Dermatitis, Allergic Contact; Dermatology; Germany; Humans; Information Services; Patch Tests

Shellac is a known allergen present mainly in cosmetics used on the eyelids and lips, although new sources of exposure have recently been described. Our objective was to assess the use of shellac as a contact allergen in Spain and the clinical profile of patients allergic to shellac.. This retrospective cross-sectional study included patients patch tested for shellac between 2018 and 2021 from the Spanish Registry of Contact Dermatitis and Cutaneous Allergy (REIDAC).. A total of 980 patients were patch tested for shellac (20% in ethanol), and 37 (3.77%, 95% confidence interval [CI], 2.58-3.97%) showed positive results. Most of these patients were tested for shellac due to a suspicion of cosmetic contact dermatitis. Seven patients with present relevance were found, five with relation to cosmetics, and the other two with an occupational background of food handling. The reaction index for shellac was 0.51 and the positivity ratio was 67.56% (95% CI, 52.48-82.65%).. Shellac appears to be a prevalent allergen in patients with suspected contact dermatitis related with cosmetics or foodstuff. However, further studies are needed to validate its use in other patients.

Topics: Allergens; Cosmetics; Cross-Sectional Studies; Dermatitis, Allergic Contact; Dermatitis, Atopic; Humans; Patch Tests; Retrospective Studies

Shellac is a known allergen present mainly in cosmetics used on the eyelids and lips, although new sources of exposure have recently been described. Our objective was to assess the use of shellac as a contact allergen in Spain and the clinical profile of patients allergic to shellac.. This retrospective cross-sectional study included patients patch tested for shellac between 2018 and 2021 from the Spanish Registry of Contact Dermatitis and Cutaneous Allergy (REIDAC).. A total of 980 patients were patch tested for shellac (20% in ethanol), and 37 (3.77%, 95% confidence interval [CI], 2.58-3.97%) showed positive results. Most of these patients were tested for shellac due to a suspicion of cosmetic contact dermatitis. Seven patients with present relevance were found, five with relation to cosmetics, and the other two with an occupational background of food handling. The reaction index for shellac was 0.51 and the positivity ratio was 67.56% (95% CI, 52.48-82.65%).. Shellac appears to be a prevalent allergen in patients with suspected contact dermatitis related with cosmetics or foodstuff. However, further studies are needed to validate its use in other patients.

Topics: Allergens; Cosmetics; Cross-Sectional Studies; Dermatitis, Allergic Contact; Dermatitis, Atopic; Humans; Patch Tests; Retrospective Studies

Topics: Allergens; Cosmetics; Dermatitis, Allergic Contact; Humans; Odorants; Patch Tests; Perfume

Topics: Alopecia; Dermatitis, Allergic Contact; Hair; Humans; Lichen Planus; Resins, Plant

Topics: Dermatitis, Allergic Contact; Humans; Mouth Protectors; Resins, Plant

Topics: Dermatitis, Allergic Contact; Dermatitis, Occupational; Humans; Patch Tests; Resins, Plant

Topics: Adult; Dermatitis, Allergic Contact; Humans; Ink; Male; Patch Tests; Resins, Plant; Tattooing

Shellac is a newly available type of long-wearing nail polish, which is becoming increasingly popular. We describe four cases of allergic contact dermatitis (ACD) to acrylates found in Shellac nail products, involving three beauticians and one consumer who purchased the product over the internet. Increasing use of these new acrylic nail products means that dermatologists need to be aware of the possibility of ACD occurring. Testing with hydroxyethyl methacrylate alone, which is included in the Australian Baseline Series, is adequate for screening for acrylate allergy.

Topics: Acrylates; Adult; Beauty Culture; Cosmetics; Dermatitis, Allergic Contact; Female; Humans; Nails; Occupational Exposure; Resins, Plant; Young Adult

Cosmetic allergic contact dermatitis (CACD) due to common cosmetic allergens in standard series has been extensively studied; however, the prevalence of contact allergy to other cosmetic allergens other than those in standard series is largely unknown. In this study, the frequency of contact sensitization to a European cosmetic series of allergens (Chemotechnique Diagnostics, Vellinge, Sweden) in healthy university student volunteers were detected in Beijing. Of 201 students studied, fifty-eight exhibited positive results, and 9 of them reported had cosmetics related dermatitis previously. The total positivity rate was not correlated to gender. The leading allergens were thimerosal (19.4%), shellac (3.0%), cocamidopropyl betaine (2.0%), hexamethylenetetramine (1.5%), dodecyl gallate (1.5%), hexahydro-1,3,5-tris-(2-hydroxyethyl)triazine (1.0%) and methyldibromo glutaronitrile (1.0%). The positivity rate of thimerosal patch test in men (9.8%) was lower than that of women (23.6%, P < 0.05, Chi square test), but no difference could be found between the prevalence of other cosmetic allergens in men and women (P > 0.05, Chi square test). These results suggested that some cosmetic-related contact allergies may be missed by just testing patients with the European standard series or T.R.U.E. test system only, we recommend shellac, cocamidopropyl betaine, hexamethylenetetramine and dodecyl gallate as the additionally candidates for patch testing in patients with suspected CACD.

Topics: Adult; Allergens; Betaine; China; Cosmetics; Dermatitis, Allergic Contact; Female; Gallic Acid; Humans; Male; Methenamine; Nitriles; Patch Tests; Prevalence; Resins, Plant; Sex Factors; Thimerosal; Young Adult

Topics: Adult; Cosmetics; Dermatitis, Allergic Contact; Eyelid Diseases; Female; Humans; Resins, Plant

The diagnostic approach to eyelid eczema is often a great problem in daily practice.. A 16-year old girl developed recurrent severe pruritic edema of the eyelids, followed by redness and scaling. Various cosmetics particularly an eyeliner were considered as possible causes. Patch testing was performed with the standard series, some supplemental series and all ingredients of the eyeliner.. The eyeliner produced a papular reaction after 2 days of open application, confirming a high degree of contact sensitization. The patient reacted with a 3+ reaction to the ingredients shellac (20% in ethanol) and 1,3-butylene glycol (2% in water). All remaining materials failed to produce a reaction.. Careful allergologic investigations are necessary in cases of edema and/or eczema of the eyelids; the cosmetics used by the patients are of utmost importance. The causative allergen may not be present in the usual patch test series and can only be identified by testing all ingredients. Shellac is now widely used in cosmetics and is increasingly identified as a contact allergen in eye make up.

Topics: Adolescent; Butylene Glycols; Cosmetics; Dermatitis, Allergic Contact; Dermatitis, Contact; Diagnosis, Differential; Eyelid Diseases; Female; Humans; Resins, Plant; Skin Tests

We report 6 cases of allergic contact dermatitis of the eyelids due to mascara. Allergy occurred in women aged 17-34 years, between September 1999 and June 2001. The main ingredient responsible for allergy was shellac, which gave positive patch test reactions in 5/5 patients. This resinous substance is mainly used in cosmetics, food and industry. The exact nature of the hapten remains unknown, and its presence and level in shellac can vary with the source and the treatments applied to it. One patient was also sensitized to quaternium-22, a quaternary ammonium compound in the cosmetic. These reports underline the rôle of networks, such as REVIDAL-GERDA, in monitoring the emergence of contact allergens and disseminating such information among the medical community.

Topics: Adolescent; Adult; Cosmetics; Dermatitis, Allergic Contact; Dimethylamines; Eyelids; Female; Humans; Patch Tests; Resins, Plant

Topics: Adult; Cheilitis; Cosmetics; Dermatitis, Allergic Contact; Female; Humans; Middle Aged; Patch Tests; Resins, Plant

Topics: Adult; Cosmetics; Dermatitis, Allergic Contact; Dimethylamines; Eyelids; Female; Humans; Patch Tests; Resins, Plant