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Contact dermatitis is a type of acute or chronic inflammation of the skin caused by exposure to chemical or physical agents. [1] Symptoms of contact dermatitis can include itchy or dry skin, a red rash, bumps, blisters, or swelling. These rashes are not contagious or life-threatening, but can be very uncomfortable.
Low humidity from air conditioning was found to be the most common cause of physical irritant contact dermatitis. [3] To the lay person a definition of low humidity being a physical irritant can be confusing because low humidity is a deficit (or absence) of an elemental substance, whereas all other irritants implicated in contact dermatitis are in concentrations of relative abundance.
Chemical burns may occur through direct contact on body surfaces, including skin and eyes, via inhalation, and/or by ingestion. Substances that diffuse efficiently in human tissue, e.g., hydrofluoric acid , sulfur mustard , and dimethyl sulfate , may not react immediately, but instead produce the burns and inflammation hours after the contact.
691.8 Eczema, atopic dermatitis; 692 Contact dermatitis and other eczema. 692.0 Contact dermatitis and other eczema due to detergents; 692.1 Contact dermatitis and other eczema due to oils and greases; 692.2 Contact dermatitis and other eczema due to solvents; 692.3 Contact dermatitis and other eczema due to drugs and medicines in contact with skin
Allergic contact dermatitis (ACD) is a form of contact dermatitis that is the manifestation of an allergic response caused by contact with a substance; the other type being irritant contact dermatitis (ICD). Although less common than ICD, ACD is accepted to be the most prevalent form of immunotoxicity found in humans. [1]
Contact dermatitis is typically treated by avoiding the allergen or irritant. [9] [10] Antihistamines may help with sleep and decrease nighttime scratching. [2] Dermatitis was estimated to affect 245 million people globally in 2015, [6] or 3.34% of the world population. Atopic dermatitis is the most common type and generally starts in childhood.
Urushiol-induced contact dermatitis (also called Toxicodendron dermatitis or Rhus dermatitis) is a type of allergic contact dermatitis caused by the oil urushiol found in various plants, most notably sumac family species of the genus Toxicodendron: poison ivy, poison oak, poison sumac, and the Chinese lacquer tree. [1]
Biopsies are typically not necessary, and cannot be used to rule out other atopic dermatitis or other eczemas. [9] [10] However, patch testing may be employed to rule out irritants (contact dermatitis) as a cause. [6] [11] In children, nummular dermatitis is commonly confused with tinea corporis. [8]