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	== Allergic Contact Dermatitis: A Delayed Hypersensitivity Reaction ==
			{{Infobox medical condition
			\| name = Allergic contact dermatitis
			\| image =[[File:Blausen_0014_AllergicDermatitis.png\|alt=Illustration of allergic contact dermatitis]]
			\| caption = Illustration of allergic contact dermatitis
			\| field = [[Dermatology]]
			\| symptoms = [[Itching]], [[redness]], [[swelling]], [[blisters]]
			\| complications = [[Infection]], [[chronic dermatitis]]
			\| onset = Hours to days after exposure
			\| duration = Days to weeks
			\| causes = [[Allergen]] exposure (e.g., [[nickel]], [[poison ivy]])
			\| risks = [[Occupation]]al exposure, [[personal care products]]
			\| diagnosis = [[Patch test]]
			\| differential = [[Irritant contact dermatitis]], [[atopic dermatitis]], [[psoriasis]]
			\| prevention = Avoidance of known allergens
			\| treatment = [[Topical corticosteroids]], [[antihistamines]], [[emollients]]
			\| frequency = Common
			}}
			== Allergic Contact Dermatitis: A Delayed Hypersensitivity Reaction ==

	Allergic contact dermatitis (ACD) is a type IV hypersensitivity reaction that occurs when the skin comes into contact with an allergenic substance. This article outlines the immunology behind ACD, common causative allergens, clinical presentation, diagnostic methods, treatment options, and prevention strategies.		Allergic contact dermatitis (ACD) is a type IV hypersensitivity reaction that occurs when the skin comes into contact with an allergenic substance. This article outlines the immunology behind ACD, common causative allergens, clinical presentation, diagnostic methods, treatment options, and prevention strategies.

Kondreddy Naveen at 20:39, 10 November 2023

2023-11-10T20:39:53Z

New page

== Allergic Contact Dermatitis: A Delayed Hypersensitivity Reaction ==

Allergic contact dermatitis (ACD) is a type IV hypersensitivity reaction that occurs when the skin comes into contact with an allergenic substance. This article outlines the immunology behind ACD, common causative allergens, clinical presentation, diagnostic methods, treatment options, and prevention strategies.

== Introduction ==

[[File:Blausen 0014 AllergicDermatitis.png|thumb|Allergic contact dermatitis showing red, inflamed skin typically associated with the condition.]]

Allergic contact dermatitis is an immune-mediated skin condition characterized by redness, inflammation, and itching, which is typically localized to the area where an allergen has made contact with the skin. Unlike immediate hypersensitivity reactions, ACD develops over time, usually within 12-48 hours after exposure.

== Immunological Mechanism ==
ACD is a type IV hypersensitivity reaction, also known as delayed-type hypersensitivity (DTH). It involves sensitization to an allergen followed by a later re-exposure that leads to an immune response. T cells play a central role in mediating this reaction, releasing cytokines that attract other immune cells to the site of allergen contact, leading to inflammation.

== Common Allergens ==

[[File:Severe allergic reaction to urushiol (poison oak) 4 days after exposure.JPG|thumb|A rash caused by poison ivy, one of the most common allergens associated with ACD.]]

Common allergens that can cause ACD include:

* Plants such as [[Poison Ivy|poison ivy]], [[Poison Oak|poison oak]], and [[Poison Sumac|poison sumac]]
* Nickel and other metals often found in jewelry and clothing fasteners
* Ingredients in personal care products like fragrances and preservatives
* Rubber components, such as those found in latex gloves

== Symptoms ==
The symptoms of ACD include:

* Red, inflamed skin
* Itching and burning sensation
* Blisters or vesicles in severe cases
* Dry, scaly, and flaky skin as the reaction subsides

== Diagnosis ==
Diagnosis is typically made through patient history and clinical examination. [[Patch Testing|Patch tests]] may be utilized to identify specific allergens responsible for the dermatitis.

== Treatment ==
Treatment options include:

* Avoiding known allergens
* Topical corticosteroids to reduce inflammation
* Cool compresses and soothing lotions like calamine to alleviate itching
* Systemic corticosteroids for severe cases

== Prevention ==
Preventive measures include:

* Education on the avoidance of known allergens
* Use of protective clothing or barriers when contact with allergens is unavoidable
* Regular skin care to maintain the integrity of the skin barrier

== Conclusion ==
Allergic contact dermatitis is a common skin condition that results from delayed hypersensitivity to contact allergens. Understanding the causative allergens and proper management strategies are crucial for reducing the incidence and severity of the condition.

[[Category:Dermatology]]
[[Category:Immune System Disorders]]
[[Category:Hypersensitivity and Allergies]]
[[Category:Skin Conditions]]

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Allergic contact dermatitis - Revision history

Prab: CSV import

Kondreddy Naveen at 20:39, 10 November 2023