Dental Update – November 2002 Abstract: Lichen planus is a relatively common, often clinically distinctive, mucocutaneous condition with an uncertain aetiology. One variant of lichen planus is the so-called ‘lichenoid drug eruption’. In contrast to idiopathic lichen planus, lichenoid drug eruptions, where practicable, may be managed by substitution of the offending drug. The dental clinician is...

Lichenoid drug eruptions can mimic idiopathic lichen planus and other dermatoses. The list of drugs that can cause them is long and growing steadily. Although cutaneous side effects of antipsychotics are rare, various cutaneous manifestations have been reported in association with olanzapine. We present the case of a patient who developed an atypical lichenoid eruption due to olanzapine. A revi...

AIM To evaluate the utility of patch test and cross-sensitivity patterns in patients with adverse cutaneous drug reactions (ACDR) from common anticonvulsants. METHODS Twenty-four (M:F = 13:11) patients aged 18-75 years with ACDR from anticonvulsants were patch tested 3-27 mo after complete recovery using carbamazepine, phenytoin, phenobarbitone, lamotrigine, and sodium valproate in 10%, 20% a...

Tattooing is an ancient art widely practiced allover the world. The procedure used in making a tattoo consists of puncturing the dermis and depositing an amount of ink, but this decorative technique is not devoid of potential adverse effects, such as infectious complications, hypersensitivity reactions to pigments (lichenoid and granulomatous reactions), the development of benign or malignant t...

We investigate Support Vector Machines (SVM ) in the context of oral lesion classification using digital color images as input. Two common lesions of similar visual appearance to the human observer were evaluated: oral leukoplakia, which is a potentially pre-cancerous lesion, and oral lichenoid reactions (with subclasses of atrophic, plaqueformed and reticular reactions), which are usually harm...

This off-center fold case depicts the difficult differential diagnosis for benign lichenoid keratosis. It is challenging to diagnosis this benign lesion through clinical exam, dermoscopy, and even dermatopathology. Given its similar appearance to regressed melanoma, it is important to be cognizant of both and up to date on the dermatopathology clues.

Sir, Lichen myxedematosus (LM) is a rare pathology, described for the ® rst time by Dubreuilh (1) in 1906, characterized by the accumulation of mucinous material in the dermis, with no disorder in the thyroid gland, and usually associated with paraproteinemia. In 1953, Montgomery & Underwood (2) classi® ed LM into 4 clinical types: (1) a generalized lichenoid eruption, later denominated sclerom...

BACKGROUND Induction of delayed hypersensitivity reactions by red tattoos has been occasionally reported. Little is known about the inks used. Azo pigments have been implicated in some instances, but there is only one reported case involving quinacridones. OBJECTIVES To describe the clinical and pathological features and outcome of skin reactions induced by red tattoo pigments. PATIENTS, MA...