Septal panniculitis is a condition of the subcutaneous fat affecting the layer of adipose tissue that lies between the dermis and underlying fascia, of which there are two forms: acute erythema nodosum and chronic erythema nodosum. : 487–9

See also
Erythema nodosum
List of cutaneous conditions
Panniculitis
Skin lesion


== References ==
Idiopathic unilateral circumscribed hyperhidrosis
Reported association with:
Blue rubber bleb nevus
Glomus tumor
POEMS syndrome
Burning feet syndrome (Gopalans)
Trench foot
Causalgia
Pachydermoperiostosis
Pretibial myxedema
Gustatory sweating associated with:
Encephalitis
Syringomyelia
Diabetic neuropathies
Herpes zoster (shingles)
Parotitis
Parotid abscesses
Thoracic sympathectomy
Auriculotemporal or Freys syndrome
Miscellaneous
Lacrimal sweating (due to postganglionic sympathetic deficit, often seen in Raeders syndrome)
Harlequin syndrome
Emotional hyperhidrosis

Cancer
A variety of cancers have been associated with the development of secondary hyperhidrosis including lymphoma, pheochromocytoma, carcinoid tumors (resulting in carcinoid syndrome), and tumors within the thoracic cavity. Endocrine
Certain endocrine conditions are also known to cause secondary hyperhidrosis including diabetes mellitus (especially when blood sugars are low), acromegaly, hyperpituitarism, pheochromocytoma (tumor of the adrenal glands, present in 71% of patients) and various forms of thyroid disease. Medications
Use of selective serotonin reuptake inhibitors (e.g., sertraline) is a common cause of medication-induced secondary hyperhidrosis. Other medications associated with secondary hyperhidrosis include tricyclic antidepressants, stimulants, opioids, nonsteroidal anti-inflammatory drugs (NSAIDs), glyburide, insulin,  anxiolytic agents, adrenergic agonists, and cholinergic agonists. Miscellaneous
In people with a history of spinal cord injuries
Autonomic dysreflexia
Orthostatic hypotension
Posttraumatic syringomyelia
Associated with peripheral neuropathies
Familial dysautonomia (Riley-Day syndrome)
Congenital autonomic dysfunction with universal pain loss
Exposure to cold, notably associated with cold-induced sweating syndrome
Associated with probable brain lesions
Episodic with hypothermia (Hines and Bannick syndrome)
Episodic without hypothermia
Olfactory
Associated with systemic medical problems
Parkinsons disease
Fibromyalgia
Congestive heart failure
Anxiety
Obesity
Menopausal state
Night sweats
Compensatory
Infantile acrodynia induced by chronic low-dose mercury exposure, leading to elevated catecholamine accumulation and resulting in a clinical picture resembling pheochromocytoma. Febrile diseases
Vigorous exercise
A hot, humid environment

Diagnosis
Symmetry of excessive sweating in hyperhidrosis is most consistent with primary hyperhidrosis. To diagnose this condition, a dermatologist gives the patient a physical exam.