Are black edges on venous ulcer serious?

Black ulcer: The black area is dead skin. This is not particularly common in a venous stasis ulcer, especially if it has clean. Other things to consider are diabetes, arterial inflow disease, autoimmune disorders, and calciphylaxis in a dialysis patient.

Several possibility: Hard to say without seeing, knowing more. If it truly is a venous ulcer, may simply be some dark old blood/ hematoma. May be skin changes that you see with venous disease whereby skin becomes discolored with hemosiderin deposits. May be some skin necrosis. Possible that may have underlying arterial disease also and necrosis. Given many possibilities, best to have a wound specialist see it.

Concerning: Since you have had an angioplasty at a young age i would be concerned about the arterial flow in your leg. The first question, is there an arterial component. Mixed pathology wounds are common in fact almost all wounds are 'multifactorial' the second question is it venous at all? Thirdly what other factors are there, diabetes, chron's disease ( is it pyoderma gangrenosum) need to see a wound dr.

Hard to say: Need to se the wound for certain. My other colleagues have answered things well. See a wound care specialist.

Necrotic tissue: Black edges on a wound our ulcer usually indicate necrotic (dead) tissue. This tissue requires removal (debridement) so as to get to healthy tissue. Once healthy tissue is reached the chances of healing improves. If black tissue is removed and new black tissue forms then this could indicate poor circulation or even infection. If you have a venous ulcer then you should see a vein specialist.