Tattoos are defined as the intentional or accidental deposit of pigment into the skin. These pigments have been associated with various dermatoses such as allergic contact dermatitis, lichenoid dermatitis, photoinduced reactions, and granulomatous, sarcoid and pseudolymphomatous reactions. The objective of this report was to describe the various types of reactions to pigments and the importance...

INTRODUCTION A variety of cutaneous reactions have been described in patients receiving tumor necrosis factor alfa (TNF-a) inhibitors. Of particular interest in this scenario is the development of lichen planus and lichen planuselike eruptions. Because TNF-a is recognized as a significant factor in the induction of these dermatoses, their appearance after inhibition of TNF-a is perplexing. The ...

Chronic graft versus host disease (GVHD) remains the most common late complication of allogenic stem cell transplantation and the most frequent cause of morbidity and mortality in these patients. To control this condition, immunosuppressive drugs are usually administered at a high dose and for a long time, which may result in several side effects. 5 patients with clinically and histopathologica...

MCI: methylchloroisothiazolinone MI: methylisothiazolinone INTRODUCTION Methylisothiazolinone and methylchloroisothiazolinone (MI/MCI) are broad-spectrum preservatives widely used in cosmetics and household and industrial products. It is well known that MI/MCI can cause allergic contact dermatitis with a spongiotic reaction pattern. Because of this reaction, restrictions have been placed on the...

FDG: fluorodeoxyglucose LPP: lichen planopilaris PET-CT: positron emission tomographye computed tomography PD-1: programmed cell death receptor 1 P embrolizumab, a programmed cell death receptor 1 (PD-1) inhibitor, has been used effectively for treatment of metastatic melanoma. Reported cutaneous adverse events ascribed to PD-1 inhibitors include lichenoid reactions such as lichen planus of the...

Tattoo artists use many compounds to create tattoo pigment and several allergic reactions can occur as a result of these additives. The compositions of many inks have been identified; however, as new mixtures are created it becomes difficult to identify the specific ingredients in a particular ink. Allergic reactions to a particular pigment can manifest in several ways including allergic contac...