An urgent referral to Dermatology was decided for evaluation of the lesions. After being seen by the Dermatology Department, the patient was advised to discontinue the new medication, and a biopsy and blood tests were performed, including a complete blood count, antibodies, lupus anticoagulant, and serology tests. Oral corticosteroids were prescribed.

After 24-48 hours, the lesions diminish in intensity and the pain subsides. Blood tests reveal the presence of leukocytosis with neutrophilia, antibodies, lupus anticoagulant, and negative serology results.

Twenty days later, the results of the skin biopsy arrived and were positive for Sweet syndrome.

Sweet syndrome (also known as acute febrile neutrophilic dermatosis) is a dermatological disease classified within neutrophilic dermatoses, since histopathologically it is characterized by the presence of neutrophil infiltrates 1 .

Clinically, it is characterized by the appearance of lesions in the form of erythematous papules or plaques