Diagnosis: Allergic skin reactions
Allergic skin reaction to B group vitamins.. Clinical photograph sourced from Wikimedia Commons (CC BY-SA 4.0). Attribution: AfroBrazilian.
Variable presentation depending on type: pruritic erythematous patches, vesicles, and papules in contact dermatitis; wheals in urticaria; well-demarcated edema in angioedema. Distribution often provides clues to the allergen.
History of exposure to potential allergens (cosmetics, metals, plants, medications). May have personal or family history of atopy. Onset timing relative to exposure helps classify reaction type — minutes (Type I) vs. 24-72 hours (Type IV).
Avoidance of identified allergen is paramount. Topical corticosteroids for localized reactions. Oral antihistamines for pruritus. Systemic corticosteroids for severe or widespread reactions. Patch testing for definitive allergen identification.
Irritant contact dermatitis, Eczema, Psoriasis, Dermatophytosis, Drug eruption
Patch testing is the gold standard for identifying contact allergens. The most common contact allergens include nickel, fragrance mix, and preservatives. Always consider occupational exposures.
Tags: allergic, hypersensitivity, contact dermatitis, immune-mediated