• Efavirenz-induced photoallergic dermatitis in HIV : AIDS

    journals.lww.com/aidsonline/Pages/articleviewer...Histology from the photo-patch test reaction showed focal spongiosis, intracellular oedema and perivascular lymphocytic infiltrates. A photoallergic reaction to efavirenz was thus diagnosed in the patient. ART is planned to be changed to lopinavir in combination with two protease inhibitors.

  • Histopathology of contact dermatitis - ScienceDirect

    Contact dermatitis is immune mediated (allergic and photoallergic contact dermatitis) or nonimmune mediated (irritant or phototoxic contact dermatitis). 1 Without specific patch testing, it may be histologically difficult to separate the two categories, especially if biopsy is not performed early; secondary changes, such as chronicity of inflammation and secondary infection, tend to obscure ... Author: Robert M. TaylorCited by: 15Publish Year: 1986

  • What is Photoallergic Contact Dermatitis? - Definition from ...

    photoallergic... CachedPhotoallergic contact dermatitis is an inflammatory rash characterized by itching and redness. Dermatitis has many causes, which can include contact with skin irritants, such as physical, chemical, and biologic agents. As an occupational skin disease, it affects workers across age groups and industries.But workers in certain occupation are at a ...

  • Experimental Photoallergic Contact Dermatitis: A Mouse Model

    (15)46446-2/pdfnode cells fTom actively sensitized mice, the histology of the reactions resembles that of classic allergic contact dermatitis in mice, challenge reactions are seen at 24 but not at 4 hr, and photoallergic contact dermatitis can be induced in B-cell deficient mice. The availability of a mouse model for the study of photo-ACD will facilitate

  • Photosensitivity - The Skin Cancer Foundation

    /risk-factors/photosensitivity CachedPhotosensitivity is heightened skin sensitivity or an unusual reaction when your skin is exposed to UV radiation from sunlight or a tanning bed. You can become photosensitive as a result of prescription or over-the-counter medications, a medical condition or genetic disorder, or even by using certain types of skin care products. There are two ...

  • photoallergic contact dermatitis - Eczema - DermIS

    photoallergic/index_eng.html CachedPhotoallergic contact dermatitis. Photoallergic contact dermatitis is an eczematous delayed type hypersensitivity response of the skin when affected by a combination of allergen and ultraviolet light (mostly UVA). Only previously sensitised persons can develop a photoallergic reaction.

  • Phytophotodermatitis Workup: Laboratory Studies, Procedures ...

    emedicine.medscape.com/article/1119566-workup CachedSep 12, 2019 · Phytophotodermatitis (PPD) is a cutaneous phototoxic inflammatory eruption resulting from contact with light-sensitizing botanical substances and long-wave ultraviolet (UV-A 320-380 nm) radiation. The eruption usually begins approximately 24 hours after exposure and peaks at 48-72 hours.

  • A case of photoallergic dermatitis caused by pirfenidone ...

    onlinelibrary.wiley.com/doi/full/10.1002/cia2.12031Oct 17, 2018 · However, it is sometimes difficult to clearly discriminate photoallergic and phototoxic effects, because both mechanisms might coexist in clinical settings. 6 Pirfenidone‐induced photoallergic dermatitis was diagnosed based on clinical images and a photopatch test. 7 In the present case, positive DLST is suggestive of an allergic mechanism in ... Author: Minori Kusakabe, Yasutomo Imai, Masaru Natsuaki, Kiyofumi YamanishiPublish Year: 2018

  • Photodermatoses: Diagnosis and Treatment

    /pmc/articles/PMC3063367Mar 04, 2011 · Phototoxic dermatitis. Phototoxic skin reactions are more common than photoallergic reactions. They are inflammatory skin reactions induced photochemically in exposed areas without an immunological basis. They manifest usually as dermatitis consistent with the symptoms of sunburn reaction. Author: Percy Lehmann, Thomas SchwarzCited by: 28Publish Year: 2011

  • Picture of Phototoxic Dermatitides - WebMD

    /skin-problems-and-treatments/... CachedPhototoxic dermatitides. In phototoxic reactivity, no immunologic mechanism is involved, and the patient reacts as anyone would to a primary irritant. Phototoxic drugs and chemicals include some ...

  • Psoriasiform Dermatoses: Microscopic Approach

    /pmc/articles/PMC3726876Psoriasiform dermatoses (PD) encompass a wide array of diseases, some of which show both clinical and histologic overlap. It is an intimidating task even to experienced microscopists to give a precise diagnosis every time and one relies heavily on clinical correlation.

  • Photoallergic Dermatitis Histology - Image Results

    More Photoallergic Dermatitis Histology images

  • Photodermatitis - Wikipedia

    en.wikipedia.org/wiki/Photodermatitis CachedPhotodermatitis, sometimes referred to as sun poisoning or photoallergy, is a form of allergic contact dermatitis in which the allergen must be activated by light to sensitize the allergic response, and to cause a rash or other systemic effects on subsequent exposure. The second and subsequent exposures produce photoallergic skin conditions ... Specialty: Dermatology

  • Pathogenesis and diagnosis of contact dermatitis ...

    CachedContact dermatitis is the most common professional skin disease, with frequencies ranging from 24 to 170 every 100000 people [].Approximately 20% of the United States population suffers from CD [], causing loss of over four million work days and costing approximately $400 million per year [3-5]. Author: Jorge A Suárez-Pérez, Ricardo Bosch, Salvador González, Ernesto GonzálezCited by: 1Publish Year: 2014

  • Photoallergic contact dermatitis to oxybenzone - COLLINS ...

    onlinelibrary.wiley.com/doi/abs/10.1111/j.1365...Patch testing, photopatch testing, phototesting, and histology produced findings strongly suggestive of oxybenzone photoallergy. Photopatch testing with a monochromator source showed abnormal UVA responses, with evidence of immediate urticaria, and delayed‐onset dermatitis. Author: P. Collins, J. FergusonCited by: 66Publish Year: 1994

  • Pathology Outlines - Allergic contact dermatitis

    /topic/skinnontumorallergic... CachedDermatitis occurs at site of contact Antigens are initially taken up by Langerhans cells and carried to lymph nodes Upon reexposure, cytokines are released, causing endothelial activation and adherence of memory T cells, which release lymphokines, causing spongiotic dermatitis Pathology Outlines - Spongiotic dermatitis Jul 31, 2011 Pathology Outlines - Polymorphous light eruption

  • Photoallergic reaction in a patient ... - BMC Dermatology

    bmcdermatol.biomedcentral.com/articles/10.1186/s... CachedNovel targeted agents have been increasingly developed and tested in clinical trials over the past 5–10 years, many with unknown and unanticipated side effects. We describe here a case of a patient with a history of metastatic follicular thyroid carcinoma that we believe developed vandetanib–associated photoallergic dermatitis while enrolled on a phase 1 clinical trial. Author: Jennifer Brooke Goldstein, Anisha Patel, Jonathan L Curry, Vivek Subbiah, Sarina Anne Piha-PaulCited by: 10Publish Year: 2015

  • 3 Contact Dermatitis Histopathology of

    (86)90059-3/pdfContact Dermatitis The epidermal histology of photoallergic contact dermatitis (PACD) and ACD is indistinguishable. The dermal inflammatory infiltrate in PACD, however, may be both superficial and deep, while it is only superfi- cial as exemplified in ACD.4

  • Photoallergic dermatitis | Dermpedia

    photoallergic-dermatitis CachedClinical Features: Delayed-type (type IV) hypersensitivity reaction that may develop secondary to a variety of topical agents or drugs; Clinically resembles allergic contact dermatitis, but the rash is confined to sun-exposed areas, as the responsible agent becomes immunogenic following exposure to light

  • Photoallergic contact dermatitis | definition of ...

    medical-dictionary.thefreedictionary.com/... Cachedphotoallergic contact dermatitis: a papulovesicular, eczematous, or exudative skin reaction that occurs 24 to 48 hours after exposure to light in a previously sensitized person. The sensitizing substance concentrates in the skin and requires chemical alteration by light to become an active antigen. Among common photosensitizers are ...

  • Atlas of dermatopathology: Phototoxic and photoallergic reactions

    atlases.muni.cz/atlases/kuze/atl_en/actinicreak... CachedPhototoxic dermatitis: dyskeratosis, necroses (in less severe forms of individual keratinocytes only). Alteration of the basal layer. Photoallergic dermatitis is characterized by spongiosis, dyskeratosis, perivascular lymphocytic infiltrate with variable admixture of neutrophils.

  • Chronic Actinic Dermatitis - an overview | ScienceDirect Topics

    chronic-actinic-dermatitisChronic actinic dermatitis can evolve from photoallergic contact dermatitis, allergic contact dermatitis, or exposure to a known photosensitizing agent; however, it can also arise de novo. Investigators have postulated that this condition represents a delayed hypersensitivity response to an unidentified antigen.

  • The Mechanism of Photoallergic Contact Dermatitis

    (15)47579-7/pdfPHOTOALLERGIC CONTACT DERMATITIS 379 photosensitizers; a total of 90 specimens was examined. Results. a) Clinical: The typical response was an eczematous reaction which could not be distinguished from contact allergy. At 24 hours the site was red and edematous. In very highly sensitized subjects, vesicles were already pres-ent at this time.

  • Two cases of lichenoid photodermatitis - Longdom

    CachedSuddenly occurring acquired hyperpigmentation on sun exposed area is often misdiagnosed as hyperpigmentary disorders due to chronic sun exposure. Lichenoid photodermatitis, a photoallergic reaction with characteristic histology showing lichenoid dermatitis, clinically appears as pigmentary dermatitis.


    jamanetwork.com/journals/jamadermatology/full... CachedTHE CHARACTERISTIC atopic reaction to patch tests with human dander and the naturally occurring lesions of the disease atopic dermatitis resemble each other grossly in the occurrence of papules, papulovesicles, redness and slight desquamation and in their chronologic development and retrogression. Author: Frank A. Simon, A. J. MillerPublish Year: 1948

  • Contact dermatitis - Wikipedia

    en.wikipedia.org/wiki/Photoallergic_contact... CachedContact dermatitis is a type of inflammation of the skin. It results from either exposure to allergens (allergic contact dermatitis) or irritants (irritant contact dermatitis). Phototoxic dermatitis occurs when the allergen or irritant is activated by sunlight. Diagnosis of allergic contact dermatitis can often be supported by patch testing. Specialty: Dermatology

  • Photosensitivity dermatitis | DermNet NZ

    /cme/dermatitis/... CachedPhotosensitivity dermatitis is the name given to an eczematous eruption arising in response to exposure to electromagnetic radiation. It is most commonly provoked by exposure to sunlight. The reaction may relate to UVB, UVA and/or visible light. It arises in all skin types. Photosensitivity dermatitis has several causes. Clinical Features of PhotosensitivityPhotosensitivity eruptions affect the exposed areas. Most often, these are the following sites. 1. Face: sparing behind ears, under nose, eyelids,...Investigations in PhotosensitivityPatch testing should be carried out in chronic photosensitivity reactions. It is negative in most patients with atopic dermatitis but there are oft...Differential Diagnosis of PhotosensitivityPhotosensitivity dermatitis may be confused with other forms of photosensitivity: 1. Polymorphic light eruption (PMLE): grouped papules arising wit...Management of PhotosensitivityManagement depends on the specific skin condition. Contact with known allergens should be avoided and photosensitising drugs stopped if possible. E...

  • Photodermatitis | AAAAI

    /ask-the-expert/photodermatitis CachedPhototoxic and photoallergic reactions can be diagnosed separately on the basis of pathogenesis, clinical characteristics, and histology. Examples of drugs capable of inducing a phototoxic reaction include amiodarone, retinoids, nonsteroidal antiinflammatory agents, diuretics, and antibiotics.

  • Contact Dermatitis: Synopsis | World Allergy Organization

    contact-dermatitis-synopsis CachedContact dermatitis from CAPB may present as an eyelid, facial, scalp, and/or neck dermatitis. Medications Benzocaine, a PABA derivative, is a sensitizer and is present in many nonprescription medications such as preparations for the treatment of hemorrhoids and burns and as a topical anesthetic.

  • Photoallergic Contact Dermatitis (Chemical photoallegy ...

    CachedPhotoallergic contact dermatitis of the face after exposure to oxybenzone. Morphology: Lesions are routinely present on the dorsum of the hands, but can appear anywhere on sun-exposed skin. Expected results of diagnostic studies Author: Vincent Deleo

  • Photocontact dermatitis | DermNet NZ

    /topics/photocontact-dermatitis CachedPhotoallergic reactions are a cell-mediated immune response in which the antigen is the light-activated photosensitising agent. Phytophotodermatitis. Another cause of photocontact dermatitis is from the interaction of UV radiation and photosensitising compounds found in various plants. This type of dermatitis is called phytophotodermatitis.

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