1/13. Allergic contact dermatitis to tea tree oil with erythema multiforme-like id reaction.The commercial production of tea tree oil, extracted from melaleuca alternifolia Cheel, has considerably increased over the past 15 years in response to a strong demand for natural remedies and aromatic substances. The number of case reports that describe allergic contact dermatitis (ACD) to this essential oil is also on the rise. We report an additional case of ACD to tea tree oil that presented with an extensive erythema multiforme-like reaction. A skin biopsy was performed from a targetlike lesion distant from the site of the initial dermatitis. The patient was treated with systemic and topical corticosteroids. Five months later, he was patch tested to the North American standard series, to his own tea tree oil, to a fresh batch of tea tree oil, and to some related allergens. The skin biopsy showed a spongiotic dermatitis without histological features of erythema multiforme. Patch testing elicited a 3 reaction to old, oxidized tea tree oil, a 2 reaction to fresh tea tree oil, a 2 reaction to colophony, a 1 reaction to abitol, and a 1 reaction to balsam of peru. We believe this is the first report of erythema multiforme-like reaction secondary to ACD from tea tree oil. Other interesting features are the stronger reaction to oxidized than to fresh tea tree oil, and concomitant reactivity to colophony, abitol, and balsam of peru.- - - - - - - - - - ranking = 1keywords = tree (Clic here for more details about this article) |
2/13. Occupational allergic contact urticaria to yucca (yucca aloifolia), weeping fig (ficus benjamina), and spathe flower (Spathiphyllum wallisii).BACKGROUND: Occupational contact urticaria (CU) from plants is often reported, but it is less often attributed to decorative houseplants. We present an atopic gardener and caretaker of plants who developed CU when occupationally exposed to weeping fig, spathe flower, and yucca. methods: Sensitization was evaluated by skin prick tests (SPT) and analyses for IgE antibodies. RESULTS: SPT were positive to all three plants, and IgE antibodies were found to weeping fig and spathe flower. SPT were also performed with several decorative houseplants in more than 600 patients. Positive SPT was found to weeping fig (12%), African milk tree (8.3%), yucca (5.8%), Chinese rose (4.7%), massangana (4.6%), bird's nest fern (3.2%), and spathe flower (3.2%). CONCLUSION: Our study indicates that SPT and tests for IgE antibody are useful in detecting occupational CU caused by houseplants.- - - - - - - - - - ranking = 0.083333333333333keywords = tree (Clic here for more details about this article) |
3/13. Sensitization to para-phenylenediamine from a streetside temporary tattoo."Temporary" henna tattoos (skin painting or pseudotattooing) are in vogue among American and European youngsters, particularly when vacationing. A 17-year-old girl presented with a severe contact dermatitis of her scalp and face after having dyed her hair with a permanent oxidative hair dye. She denied previous use of oxidative hair dye. Eight months earlier she had a "temporary" henna tattoo applied on her shoulder by a transient artist in downtown Montreal and developed an acute, erythematous, edematous eruption that resolved with residual, prolonged hyperpigmentation. As henna tattooing is a lengthy and tedious procedure, para-phenylenediamine (PPD) may be added to the mixture to accelerate the process, to darken, and to give more precision to the design. This short-lived fad can have longer-term sequelae then expected, ranging from postinflammatory hyperpigmentation of the tattoo site to permanent sensitization to PPD and related compounds.- - - - - - - - - - ranking = 0.33333333333333keywords = tree (Clic here for more details about this article) |
4/13. Immediate systemic hypersensitivity reaction associated with topical application of Australian tea tree oil.Australian tea tree oil has been used as a veterinary antiseptic for many years and, more recently, has been extended into human use. There have been many reports of allergic contact dermatitis and toxicity reactions, but it has never been implicated in immediate systemic hypersensitivity reactions. A 38-year-old man experienced immediate flushing, pruritus, throat constriction, and lightheadedness after topical application of tea tree oil. Our purpose was to determine whether this represented an immunoglobulin e (IgE)--mediated reaction. skin-prick and intradermal testing was performed, as well as enzyme-linked immunosorbent assays for specific IgG and IgE against tea tree oil. The patient had a positive wheal and flare reaction on intradermal testing with tea tree oil. All five patient controls were negative on skin testing. No specific IgG or IgE was detected. We present the first reported case of an immediate systemic hypersensitivity reaction occurring after topical application of Australian tea tree oil, confirmed by positive wheal and flare reaction on skin testing.- - - - - - - - - - ranking = 0.75keywords = tree (Clic here for more details about this article) |
5/13. Caterpillar dermatitis in two siblings due to the larvae of Thaumetopoea processionea L, the oak processionary caterpillar.Two siblings, 16 months and 5 years of age, came into contact with the urticating hairs (setae) of oak processionary caterpillars, the larvae of Thaumetopoea processionea L., when the family moved to a suburb of Vienna, where mass gradation of T. processionea had started the year before. The setae were being spread by the wind from an infested oak tree in the neighbourhood. Both children repeatedly suffered bouts of dermatitis during the 10 weeks of the larval development. Owing to the fact that T. processionea often infests oak trees, whether isolated or at the edges of forests, there is a high likelihood of people being affected. Children frequently explore their surroundings and are at an even greater risk of developing lepidopterism. Caterpillar dermatitis should therefore be taken into consideration in the differential diagnosis of a pruritic rash in infants from regions with caterpillar-infested trees, especially during the larval development of T. processionea .- - - - - - - - - - ranking = 0.25keywords = tree (Clic here for more details about this article) |
6/13. Allergic contact dermatitis in children: strategies of prevention and risk management.Over recent years, allergic contact dermatitis in children has repeatedly been reported as a significant clinical problem. It is generally accepted that allergic contact dermatitis is rare in the first years of life, and with increasing age (by the age of 10 years) reaches the incidence seen in adults. As in adults, metals are one of the most common sensitizers in children, along with rubber chemicals and fragrances. The influence of fashion trends and lifestyle such as piercing, decorative skin paintings, the hype of natural remedies and cosmetics (e.g. tea tree oil) or the use of cosmetical products with fragrances or herbal ingredients play an important role in developing allergic contact dermatitis. This review aims to give an overview on allergic contact dermatitis in childhood by focussing on strategies for prevention, potential risk factors and recommendations for parents as well as for physicians. By reporting typical cases of our outpatients clinic we point out several characteristics of allergic contact dermatitis. Prevention of allergic contact dermatitis in children is a current problem of interdisciplinary concern not only for dermatologists and paediatricians, but also for midwives. Frequently, children are already exposed at an early age to well-known allergens, and therefore, strategies of avoidance have to gain or regain importance and should start as early as possible.- - - - - - - - - - ranking = 0.083333333333333keywords = tree (Clic here for more details about this article) |
7/13. Occupational allergic contact dermatitis from lichens in present-day finland.lichens are abundant in forests, living on trees, soil, stones and rocks. They contain usnic acid and other lichen acids that are contact allergens. lichens and liverworts cause woodcutter's dermatitis, eczema that appears in the forest on the bare skin areas, especially in cold and wet weather. Occupational allergic contact dermatitis from lichens occurs in forestry and horticultural workers and in lichen pickers. lichens can cause immediate allergy, contact urticaria, rhinitis and asthma and probably also photoallergic contact dermatitis. lichens are used for the manufacture of oak moss absolute, a fragrance constituent. Oak moss absolute contains lichen acids and is one of the commonest contact allergens. Lichen acid allergy develops either from contact with lichens or from fragrances. We describe 4 cases of occupational allergic contact dermatitis from lichens during the past decade: 2 were farmers and 2 gardeners. 3 of them had allergic reactions to fragrance mix and oak moss absolute. Lichen contact allergy is an old, partly forgotten, syndrome that should be remembered for symptoms in contact with barked wood or wood dust.- - - - - - - - - - ranking = 0.083333333333333keywords = tree (Clic here for more details about this article) |
8/13. Allergic contact dermatitis from salicyl alcohol and salicylaldehyde in aspen bark (populus tremula).Salicyl alcohol or 2-methylolphenol is a well-known allergen in phenol-formaldehyde resins and a strong sensitizer in guinea pigs. There is 1 previous report of allergic contact dermatitis from salicyl alcohol in aspen bark. We describe a second case with concomitant allergy to salicylaldehyde. An elk researcher who had handled leaves from various trees presented with eczema of the hands, face, flexures, trunk and extremities. Patch testing showed sensitivity to salicyl alcohol, salicylaldehyde, balsam of peru (myroxylon pereirae resin), aspen wood dust and an extract prepared from the bark of aspen (populus tremula). Weaker reactions were observed to bark extracts of rowan (sorbus aucuparia), tea-leaved willow (salix phylicifolia) and goat willow (salix caprea). We analysed salicyl alcohol and salicylaldehyde in the bark extracts and found the 2 chemicals in equal amounts, about 0.9 microg/mg in aspen bark and in lower concentrations in rowan and the willows. We did not find either of the chemicals in the test substance of balsam of peru (myroxylon pereirae). Besides salicyl alcohol, salicylaldehyde is also recommended to be used to screen for contact allergy to aspen. Both of these chemicals should be tested in forest workers in areas where aspen is growing.- - - - - - - - - - ranking = 0.083333333333333keywords = tree (Clic here for more details about this article) |
9/13. Contact dermatitis following sustained exposure to pecans (carya illinoensis): a case report.Type I hypersensitivity reactions following ingestion of peanuts and tree nuts are well characterized. Cutaneous hypersensitivity reactions are less well characterized, yet they remain the second most common reaction pattern to contact with or ingestion of such nuts. We present a case of a patient who experienced an acute vesicular cutaneous reaction after prolonged contact with pecans. This case illustrates the salient features of contact dermatitis and serves as a reminder that contact with allergenic foods can lead to hypersensitivity reactions.- - - - - - - - - - ranking = 0.083333333333333keywords = tree (Clic here for more details about this article) |
10/13. Mango dermatitis: allergic contact dermatitis to mangifera indica.Mango dermatitis' is the common term given to allergic contact dermatitis to the sap or skin of the fruit of mangifera indica. Four patients presented with urticaria and eczematous rash following exposure to mangoes or the trees. Patch testing with diluted sap, crushed leaf, crushed stem and fruit skin was strongly positive.- - - - - - - - - - ranking = 0.083333333333333keywords = tree (Clic here for more details about this article) |
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