Background: Hyperpigmentation is a common dermatologic problem that may have substantial impact on the patient, since it affects the appearance and quality of life, and may influence treatment adherence. There are few studies of drug-induced hyperpigmentation. Methods: We studied drug-induced hyperpigmentation in patients attending an outpatient dermatology clinic in the Western Area of Valladolid (Spain) from August 1, 2017 to April 20, 2018. Results: The incidence of drug-induced hyperpigmentation was 1.31% in patients attending a first dermatology consultation in the study period. Of the 16 patients, 8 were taking more than 1 drug. The most frequent drugs identified were nonsteroidal anti-inflammatory agents (25%), antihypertensive agents (18.75%), antimalarials (12.5%), antibiotics, antineoplastic agents, psychoactive agents, simvastatin, allopurinol, amiodarone and mucolytic (6.25% each). Hyperpigmentation was found in the mucosa in 25% of patients and in photograph-exposed areas in 37.5%. Discussion: Diagnosing drug-induced hyperpigmentation is a dermatologic challenge. A differential diagnosis with hyperpigmentation caused by endocrine and metabolic disorders, the most closely-related disorders to drug-induced hyperpigmentation, and with hyperpigmentation of idiopathic origin, should be conducted. Drug-induced hyperpigmentation is a relatively frequent reason for consultation, especially in polypharmacy patients. The sample may have been biased as many patients receiving treatments frequently associated with drug-induced hyperpigmentation, such as antineoplastic drugs, are diagnosed and treated by other specialties, such as oncologists. Conclusion: Family physicians and specialists should consider drugs as a cause of hyperpigmentation to facilitate the correct diagnosis and treatment.

In this article we describe two cases that presented with persistent fever and a hyperinflammatory state in association with severe acute respiratory syndrome-coronavirus-2 infection with various negative reverse transcription-polymerase chain reaction results. These cases subsequently developed myocarditis with cardiogenic shock that required vasoactive drugs and had a good response to corticosteroid treatment. All cases met criteria for a definitive case of multisystemic inflammatory syndrome in adults, a recently described entity associated with coronavirus disease 2019, which has a good response to immunomodulators and a good prognosis in most cases.

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La linfadenopatía histiocítica necrotizante o enfermedad de Kikuchi (EK) es una entidad clínica que se observa con poca frecuencia y que en ocasiones se asocia con lupus eritematoso sistémico (LES). Se ha considerado que las características histológicas del trastorno son indistinguibles de las de la linfadenitis en sujetos con LES, y los síntomas clínicos de los dos trastornos comparten características comunes. En este artículo se presenta un caso clínico de una mujer de 23 años con antecedente de EK que posteriormente desarrolla LES.