Conditions that can mimic erythema nodosum are skin infections, certain systemic diseases and other types of panniculitis.
Conditions that are sometimes mistaken for and can mimic erythema nodosum are cellulitis, erysipelas, deep fungal infections, insect bites, deep thrombophlebitis, cutaneous polyarteritis nodosa, eccrine hidradenitis, lupus panniculitis, deep granuloma annulare henoch schonlein purpura and Erythema induratum.
Cellulitis is inflammation and redness and can resemble erythema nodosum, although cellulitis often presents itself with more prominent inflammatory symptoms and can be unilateral.
Erysipelas is a bacterial skin infection that is similar to cellulitis and can cause redness and inflammation and can mimic erythema nodosum.
Deep fungal infections such as Majocchi granuloma or sporotrichosis can manifest as nodules which resemble erythema nodosum.
Deep thrombophlebitis can present with painful nodules which can be mistaken for erythema nodosum.
Cutaneous polyarteritis nodosa can cause skin nodules that resemble erythema nodosum.
Eccrine hidradenitis can be confused with erythema nodosum if the lesions are located on the palms or soles.
Lupus panniculitis is a condition that affects your skin and subcutaneous fat, which can cause nodules which resemble erythema nodosum, especially when located on your upper limbs and healing with tropical scars.
Deep granuloma annulare are deep subcutaneous nodules which can be mistaken for erythema nodosum and erythema induratum is a condition that is known as nodular vasculitis and can be difficult to distinguish from erythema nodosum, especially when the lesions are few in number, long lasting and located on your posterior aspect of your lower legs.
And pancreatic panniculitis is a condition that is associated with pancreatic disorders and can cause skin nodules that mimic erythema nodosum and nodular vasculitis is also similar to erythema nodosum and can present with nodules that resemble erythema nodosum.
Subcutaneous sweet syndrome is a condition that can also mimic erythema nodosum and can be painful.
Erythema nodosum is not lupus, although erythemia nodosum an be associated with lupus.
Erythema nodosum is a type of panniculitis, which is an inflammation of the fat layer on your your skin.
Erythema nodosum often causes tender, red nodules, that usually occur on your shins.
And while erythema nodosum can be a symptom of various health conditions, including infections, inflammatory bowel disesae and a result of some medications, erythema nodosum can also manifest from lupus erythematosus or more specifically lupus erythematosus panniculitis.
The condition erythema nodosum is a common form of panniculitis which results in tender, red nodules that are often on your shins and can be triggered by infections such as COVID-19, strep throat or even from medications like sulfa drugs or penicillin, or even other conditions such as inflammatory bowel disease.
Lupus erythematosus is a chronic autoimmune disease, in which your body's immune system attacks it's own tissues and can potentially affect various organs including your skin.
Lupus Erythematosus panniculitis is a rare form of cutaneous lupus that results in subcutaneous nodules, and could even be potentially ulcerated, and may appear in people with lupus.
Erythema nodosum is often benign, "non cancerous" and self limiting, and lupus is often a chronic and potentially serious disease.