Subcutaneous Sweet Syndrome Presenting as Cellulitis in a Pregnant Female.

We report a case of subcutaneous Sweet syndrome in a pregnant woman that was initially believed to be cellulitis. She was admitted after failure of symptom resolution following multiple oral antibiotics as an outpatient. Her rash continued to progress, and she became nauseous with a lack of appetite. Infectious disease, rheumatology, and dermatology were consulted. Skin biopsies were taken, and while awaiting results, due to continued disease progression despite broad-spectrum antibiotic coverage, IV steroids were started with rapid resolution. Eventual biopsy results showed a dense neutrophilic infiltrate in the subcutaneous fat in a lobular distribution without evidence of vasculitis, confirming a diagnosis of subcutaneous Sweet syndrome. This disease is exceedingly rare in pregnant patients, with few reported cases.