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What is Neutrophilic eccrine hidradenitis and explain in detail?
Neutrophilic eccrine hidradenitis (NEH) usually is a cutaneous complication of chemotherapy, but it can also occur for other reasons. It consists of fever and non specific skin lesions. It is rare, and self-limited.

Signs and symptoms
Fever and a non specific skin eruption – with reddening (erythema) and swelling (oedema) of the skin – are the most common symptoms of NEH. Patients usually present with the skin eruption 1-2 weeks after use of the cytotoxic drug. Sometimes, the skin eruption can be painful. Skin eruptions can be located on the extremities, trunk, and face. Severe lesions are rare, and can mimic cellulitis. Generalised lesions resembling erythema multiforme have been reported.

Cause
The overwhelming majority of neutrophilic eccrine hidradenitis (NEH) is seen in people with cancer, especially leukaemia, who receive chemotherapy with a cytotoxic drug. These include: Bleomycin, chlorambucil, cyclophosphamide, cytarabine, doxorubicin, lomustine, mitoxantrone, topotecan, and vincristine.NEH was first described in 1982 in a patient with acute myeloid leukaemia (AML) who had received cytarabine as chemotherapy.Cancer itself, infections, and other medicinal drugs also can lead to NEH. NEH has been reported in patients with cancer who have not received any form of chemotherapy (i.e., as a paraneoplastic syndrome), in patients with HIV and/or AIDS, and after the use of paracetamol (acetaminophen). Also the use of targeted agents can lead to NEH, e.g. imatinib, a tyrosine kinase inhibitor.NEH has also been described without any known reason (idiopathic cases), including idiopathic cases in children.The exact cause of NEH is unknown