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Itching, sneezing, and inflammatory responses are suppressed by antihistamines that act on H1-receptors. [ 2 ] [ 8 ] In 2014, antihistamines such as desloratadine were found to be effective to complement standardized treatment of acne due to their anti-inflammatory properties and their ability to suppress sebum production.
The exact mechanism of the condition is unknown. Some studies have suggested the itching occurs in response to increased fibrinolytic activity in the skin, [5] [6] inappropriate activation of the sympathetic nervous system, [7] increased activity of acetylcholinesterase, [8] [9] or an increase in mast cell degranulation that releases histamine and other chemicals into the body.
Antihistamines, specifically H1-antihistamines, are medicines which provide relief for allergic symptoms such as runny nose, sneezing, itching, and watery eyes from seasonal allergies . They are usually the first line of medications prescribed by a general practitioner, or a pharmacist for allergies in a community pharmacy.
Antihistamines are commonly used to treat itching associated with allergies. Generalized itch, or itching across the whole body, can be a symptom of a dermatological disorder or an underlying systemic problem. [13] Some systemic diseases can that cause generalized itch include diabetes, hypothyroidism, kidney diseases and liver diseases.
[5] [64] Sedative antihistamines, such as diphenhydramine, may be useful in those who are unable to sleep due to eczema. [5] Second generation antihistamines have minimal evidence of benefit. [65] Of the second generation antihistamines studied, fexofenadine is the only one to show evidence of improvement in itching with minimal side effects. [65]
For cutaneous diseases, the diagnosis could be dry skin (with flare ups at dry climate), irritant and allergic contact dermatitis (skin lesions), seborrheic dermatitis (skin lesions), atopic dermatitis (scratching, allokinesis, stinging, burning), psoriasis (skin lesions), urticaria (welts/skin swelling).