Introduction
EED is a form of chronic cutaneous vasculitis of unknown underlying
etiology.1 EED was named by Henry Radcliff-Crocker and
Williams in 1894 but discovered earlier in 1878 by Hutchinson. It
presents clinically as asymptomatic, firm, erythematous to yellowish
papules, nodules, or plaques involving the extensor surface of
extremities often over joints.1 Antigen-induced small
vessel vasculitis is believed to be the cause. Various infections and
systemic disorders like streptococcal throat infection, tuberculosis,
HIV 1, HIV 2, Hepatitis B, Rheumatoid arthritis, ankylosing spondylitis,
Sarcoidosis, Crohn’s disease, Ulcerative colitis, Pyoderma gangrenosum,
Paraproteinemia, Myelodysplasia, Kaposi’s sarcoma have been reported to
be associated.1 The clinical presentation of EED
varies as the lesions progress leading to diagnostic
difficulties.1