This damage is not really well understood at the moment. These are small ink bumps that appear on red ink marks. • This mucocutaneous disease can manifest as desquamative gingivitis, asymptomatic Wickham striae or plaques, or severe, painful erosions or ulcerations anywhere in the oral cavity. Drugs commonly linked to allergies Lichenoid photodermatitis is a photo-allergic reaction. Histologically, lichenoid drug reactions resemble lichen planus at low-power magnification. A lichenoid eruption has been attributed to tenofovir ... [90], and an oral lichenoid reaction ... Allergic disorders. The signs are purple, itchy skin rashes on the skin. Lichenoid drug reaction Differential diagnosis Lichen planus: different sites (flexor arms / legs, glans penis and mucous membranes), lasts 1 - 2 years, not associated with drug administration, no prominent eosinophils ( Indian J Dermatol Venereol Leprol 2011;77:418 ) So, it’s also understood as lichenoid photo-induced dermatitis. Mercury (red pigment) is responsible for most lichenoid tattoo reactions. Allergic … We have described two cases of lichenoid reaction developing to red ink in colored tattoos. Introduction: Utility of various dental materials ranging from diagnosis to rehabilitation for the management of oral diseases are not devoid of posing a potential risk of inducing allergic reactions to the patient, technician and dentist. This is also true with dyshidrotic dermatitis and other types of conditions caused by allergic reactions. These types of reactions are much less common than eczematous hypersensitivity reactions. For reasons unknown, the two layers of skin develop an allergic reaction to each other. Allergic reactions to a particular pigment can manifest in several ways including lichenoid reaction, allergic contact dermatitis and photoallergic dermatitis, granulomatous or pseudolymphoma reactions. therefore the etiology of olls may represent the oral manifestation of a chronic irritation in some patients or to be the clinical result of a delayed hypersensitivity reaction in others. It has been shown that the most common oral manifestations are cheilitis, gingivitis, stomatitis, perioral dermatitis, burning mouth syndrome, lichenoid reaction and orofacial granulomatosis. Case Report Case 1 Components of amalgam may, in rare instances, cause local side effects or allergic reactions referred to as oral lichenoid lesions (OLLs). It is an expression of delayed hypersensitivity to a lymphocytic T-cell infiltrate. 1,2 The prevalence of LR has been reported to be approximately 2.4% in the general population and occurs in women three times more than in men. There is an established relationship between various dental materials and OLR, but few cases reports reported the occurrence of a lichenoid reaction in association with the use of a Hawley retainer. Etiology: Lichenoid reactions may be caused by sensitivity to amalgam restorations, metal sensitivity such as to orthodontic wires, partials, etc. Lichenoid reaction (LR) is an adverse effect which may be caused by systemic administration of drugs including antihistamine, corticosteroid and some other triggers. 35-70. Evidence exists that the lichenoid reaction is an expression of delayed hypersensitivity to a lymphocytic T-cell infiltrate, which may simulate the graft-versus-host response. What Causes Lichenoid Dermatitis? Clues that a lichenoid tissue reaction represents a lichenoid drug eruption include parakeratosis, diminished granular cell layer, and a mixed inflammatory infiltrate, including … which in turn can cause a lichenoid pattern of reaction [22]. 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