At a recent conference, Dr. Steven Chen emphasized the important role of dermatology in hospital settings, noting that the skin often reveals underlying conditions before medical records do. Across five case studies, he outlined key strategies for diagnosing and managing common cutaneous eruptions, offering insights for hospitalists on early intervention and collaboration with dermatologists.
Stevens-Johnson Syndrome and Toxic Epidermal Necrolysis (SJS/TEN)
A 69-year-old man with follicular lymphoma developed a severe rash after starting trimethoprim-sulfamethoxazole for PCP prophylaxis. The condition progressed from SJS to TEN, with a rash covering over 10% of his body surface area. Dr. Chen highlighted the importance of distinguishing between target lesions and macular targetoid lesions, which have different prognoses. Immediate actions include discontinuing the offending agent, avoiding debridement, and consulting specialists. Prognostic tools like SCORTEN and emerging treatments such as JAK inhibitors were discussed.
Drug Reaction with Eosinophilia and Systemic Symptoms (DRESS)
A 55-year-old man developed a confluent erythematous rash and systemic symptoms five weeks after starting nafcillin. DRESS typically presents two to six weeks after drug exposure, with mortality rates as high as 10% due to hepatotoxicity. Diagnosis relies on clinical evaluation and the RegiSCAR scoring system. Treatment includes steroids and, in some cases, cyclosporine. Hospitalists were advised to meticulously track medications to identify the culprit drug, as latency windows often align with rash timelines.
Other cases included purpura fulminans, a life-threatening condition linked to microvascular occlusion, and pyoderma gangrenosum, where surgical debridement can worsen the condition. Early recognition and avoiding debridement were emphasized. For cutaneous small vessel vasculitis, removing triggers and using topical steroids were recommended, with systemic treatments reserved for severe cases.
Dr. Chen concluded with practical takeaways: early dermatology consultation, recognizing retiform purpura as a sign of vasculopathy, and tailoring workups based on obvious triggers. These insights aim to improve outcomes through timely, targeted interventions.
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Purpura Fulminans
A 44-year-old man presented with flu-like symptoms following a dog bite and developed retiform purpura during a CT scan. Purpura fulminans, a rare but severe form of disseminated intravascular coagulation, manifests as angular, stellate, or geographic-shaped purpura, often mistaken for other conditions. The differential diagnosis includes encapsulated organism sepsis, tick-borne illnesses, and antiphospholipid syndrome. A critical aspect of management involves a detailed history to identify risk factors such as splenectomy, immunization status, and recent animal exposures. In this case, Capnocytophaga canimorsus was identified, showing the urgency of rapid escalation to broad-spectrum antibiotics, intensive care, and resuscitation. The visual hallmark of retiform purpura serves as a key warning sign for hospitalists to initiate aggressive intervention before irreversible organ damage occurs.
Pyoderma Gangrenosum (PG)
A 72-year-old woman developed exquisitely tender, expanding ulcers following a laparoscopic cholecystectomy converted to open surgery. Pyoderma gangrenosum, a neutrophilic dermatosis, exhibits a pathergy phenomenon where surgical trauma exacerbates the condition. The consulting dermatologist emphasized the necessity of halting further surgical debridement to prevent worsening ulcers. Diagnosis hinges on clinical exclusion, supported by biopsy and culture to rule out infection. Treatment typically involves high-dose corticosteroids, with adjunctive antibiotics pending culture results. For patients with a history of PG, preoperative planning with steroid or cyclosporine coverage is advised to mitigate the risk of postoperative flare-ups.
Cutaneous Small Vessel Vasculitis (CSVV)
Palpable purpura on the lower extremities is the hallmark of cutaneous small vessel vasculitis, a condition distinct from Henoch-Schönlein purpura. While many cases respond to trigger removal and topical steroids, systemic evaluation is warranted in the presence of ulceration or signs of systemic vasculitis. Laboratory testing should include antineutrophil cytoplasmic antibodies, cryoglobulins, rheumatoid factor, antinuclear antibodies, and complement levels. However, if a clear precipitating factor is identified—such as an infection or medication—an exhaustive workup may be unnecessary. Direct immunofluorescence for IgA deposition is most informative within 48 hours of symptom onset, necessitating timely biopsy if pursued.
Each drug rash carries a characteristic latency window: exanthematous at one to two weeks, SJS or TEN at one to three weeks, DRESS at two to six weeks, and urticaria within hours. Retiform purpura signals vasculopathy or vasculitis until proven otherwise. Early recognition of neutrophilic dermatoses can be tissue- and life-saving. Not every vasculitis needs an exhaustive workup if the trigger is obvious. And when in doubt, call dermatology early, ideally before the rash sings its second verse.
