CHP is a rare and often fatal form of panniculitis with multisystem involvement. But it can also present in a benign form involving only the subcutaneous tissue, thus having a broad clinical spectrum. Traumatic panniculitis is a panniculitis that occurs following trauma to the skin. : 492 
Cold panniculitis is a panniculitis occurring after exposure to cold, most often seen in infants and young children. : 491   This condition has been described in children who suck ice or popsicles, and therefore is sometimes referred to as "popsicle panniculitis. ": 491  The term was coined when a patient with a rash of unknown origin on her cheek was taken to a dermatologist. Gouty panniculitis is a panniculitis caused by deposition of uric acid crystals in gout. : 494 
Pancreatic panniculitis (also known as enzymatic panniculitis, Pancreatic fat necrosis, and subcutaneous fat necrosis) is a panniculitis most commonly associated with pancreatic carcinoma, and more rarely with anatomic pancreatic abnormalities, pseudocysts, or drug-induced pancreatitis. : 493 
Factitial panniculitis is a panniculitis that may be induced by the injection of organic materials, povidone, feces, saliva, vaginal fluid, and oils. : 492

With needle-shaped clefts
Lipodermatosclerosis is a form of panniculitis associated with chronic venous insufficiency that presents with brown indurations on the front of the shins. It may be associated with pain and other signs of chronic venous insufficiency. The exact cause is unknown.Other forms include:

Subcutaneous fat necrosis of the newborn, a form of panniculitis occurring in newborns that is usually self-resolving, that may be a result of hypoxic injury to relatively high levels of brown fat.
Diagnosis
Classification
It can occur in any fatty tissue (cutaneous or visceral) and is often diagnosed on the basis of a deep skin biopsy, and can be further classified by histological characteristics based on the location of the inflammatory cells (within fatty lobules or in the septa which separate them) and on the presence or absence of vasculitis.There are thus four main histological subtypes:
lobular panniculitis without vasculitis (acute panniculitis, previously termed Weber–Christian disease, systemic nodular panniculitis)
lobular panniculitis with vasculitis
septal panniculitis without vasculitis
septal panniculitis with vasculitis

Lobular
With vasculitis
Erythema induratum, or "Bazin disease", is a panniculitis on the back of the calves. It was formerly thought to be a reaction to the tuberculum bacillus. It is now considered a panniculitis that is not associated with a single defined pathogen.Nodular vasculitis is a skin condition characterized by small, tender, reddened nodules on the legs, mostly on the calves and shins. Microscopically there are epithelioid granulomas and vasculitis in the subcutaneous tissue, making it a form of panniculitis. Most of these cases are now thought to be manifestation of tuberculosis and indeed they respond well to anti-tuberculous treatment. Without vasculitis
Non-vasculitis forms of panniculitis that may occur include:

Cytophagic histiocytic panniculitis was first described in 1980 by Winkelmann as a chronic histiocytic disease of the subcutaneous adipose tissue, which is characterized clinically by tender erythematous nodules, recurrent high fever, malaise, jaundice, organomegaly, serosal effusions, pancytopenia, hepatic dysfunction and coagulation abnormalities. : 494  CHP may occur either isolated or as part of cutaneous manifestations of hemophagocytic syndrome (HPS).