Fever, malaise, neutrophilia and skin rash

A middle aged man presented with fever, malaise, and neutrophilia,  followed by  skin rash (shown in the picture).
What's your diagnosis?

Check the answer below:

The answer is : Acute Febrile Neutrophilic Dermatosis (Sweet's Syndrome)

This is an acute febrile illness characterized by  increased neutrophil count, and the appearance of tender and purple papules, that coalesce to form plaques.

It's considered a hypersensitivity reaction to some factors, commonly infection, inflammation, exposure to a medication or vaccination.