Background:Drug eruptions range from transient erythema to the life threatening severe cutaneous adverse reactions (SCAR) that encompass Stevens–Johnson syndrome (SJS), toxic epidermal necrolysis (TEN), acute generalized exanthematous pustulosis (AGEP) and drug reaction with eosinophilia and systemic symptoms complex (DRESS).Aims and Objectives:To study the clinical and epidemiological aspects of cutaneous adverse drug reactions (CADR).Materials and Methods:Ethical clearance was obtained from the institutional ethics committee. All patients admitted in the Dermatology ward of our tertiary care hospital with CADR (those who fit in the category of probable or possible drug reaction as per WHO casuality assessment) from first September 2011 to 31st August 2012 were included in this cross sectional study after obtaining written informed consent. The drug reaction patterns observed in the study population were determined and the common offending drugs were identified.Results:In the study, population of males outnumbered females and the majority were between 46 and 60 years of age. The commonest reaction pattern observed was SJS- TEN spectrum of illness and aromatic anticonvulsants were the common offending drugs. Prompt withdrawal of the culprit drug and administration of systemic steroids with or without I/V Ig reverted the adverse reaction in all except one.Conclusion:Severe drug reactions predominated as the study population was comprised of inpatients of a tertiary referral centre. Though; previous authors had reported a mortality rate of up to 20% in DRESS, all our patients with this reaction pattern, responded well to treatment. The mortality rate among TEN cases was much lower than the previous reports. Early diagnosis, prompt withdrawal of the suspected drug, careful monitoring for development of complications and immediate intervention can improve the prognosis of CADR.

Drug reaction with eosinophilia and systemic symptoms (DRESS) is a severe adverse drug reaction that can affect any age group. We carried out a prospective study of the clinicoepidemiologic aspects of DRESS in children. We prospectively studied all patients ages 12 years and younger admitted to the departments of pediatrics and dermatology at a tertiary care hospital over a 3-year period with probable or definite DRESS, defined based on the RegiSCAR scoring system. A total of 11 patients were studied. Lamotrigine (four patients) and pencillins (three patients) were the most common offending drugs. Not adhering to the standard guidelines of introduction and gradual titration of lamotrigine to therapeutic dose may have increased the chance of lamotrigine-induced DRESS. A short latent period between the onset of drug intake and drug reaction was noted in DRESS induced by antibiotics.

Studies on the predictors of severity in drug reaction with eosinophilia and systemic symptoms in different population groups may enable us to identify the warning signs and help to formulate the standard therapeutic guidelines.

Intense facial erythema and edema and an elevated eosinophil count were not found to be bad prognostic factors. In most instances the flare ups during the course of the disease could be managed with a slower tapering of steroids. More prospective studies on DRESS are required to assess the prognostic factors and to formulate better diagnostic criteria.

Bullous pemphigoid (BP) is a blistering disorder due to autoantibodies to the epidermal basement membrane zone. The triggering factor could be localized damage to the skin by physical or chemical agents. We report a case of a 68-year-old woman with a three year history of oral lesions of BP following radiotherapy for carcinoma of the hypopharynx, and a three month history of BP over lymphedematous sites on the right hand and right lower limb. Localized BP induced by radiotherapy or lymphedema is rare; both factors working simultaneously in the same patient is even rarer.

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In the appropriate setting, varying combinations of epidermal hyperplasia, spongiosis, parakeratosis and individually necrotic keratinocytes in the background of lymphocyte predominant dermal infiltrate (with some atypia) favor a diagnosis of drug reaction with eosinophilia and systemic symptoms. Female sex, the presence of atypical lymphocytes in peripheral smear, dense dermal inflammatory infiltrate, tissue eosinophilia and interface dermatitis with or without keratinocyte necrosis was associated with a poor prognosis.

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