Bleeding and bruising - DermNet
2017年8月14日 · Larger blood vessels, such as arteries, lead to more profuse and prolonged bleeding than smaller ones, such as capillaries. Once bleeding has stopped, a blackish crust or scab forms while the wound heals underneath. Typically, a bruise first appears as a reddish patch, which develops over a few hours into a blue, black or purple discolouration ...
Achenbach syndrome: Painful Blue Finger - DermNet
Achenbach syndrome is a subcutaneous bruise probably due to minor fragility of capillaries or a small vein in the palmar skin. Preceding minor trauma may be recalled in 30% of cases such as sweeping, handwashing of clothing, or cycling. There is no associated serious cause for easy bruising such as a clotting disorder or vascular abnormality.
Subungual haemorrhage - DermNet
The hyponychium (the skin under the free distal edge of the nail) may appear thickened due to blood between the nail plate and the nail bed. Subungual haemorrhage may appear reddish, purple, brown, black, or a combination of these colours. The variation in colour is related to the duration and stage of healing [2].
Purpura: Causes, Types and Images - DermNet
Purpura is the name given to the discolouration of the skin or mucous membranes due to haemorrhage from small blood vessels. Petechiae are small, purpuric lesions up to 2mm across; Ecchymoses or bruises are larger extravasations of blood. Palpable purpura is purpura than can be felt, due to inflammation of the blood vessels
Senile purpura - DermNet
As a result, superficial vessels tear and rupture even with negligible trauma. The subsequent extravasation of blood into the surrounding dermis results in the development of dark purple ecchymoses. Persistent brown pigmentation following the resolution of the bruises results from the deposition of haemosiderin, a component of red blood cells.
Warfarin-induced skin necrosis - DermNet
Warfarin is an anticoagulant medicine (blood thinner). Warfarin-induced skin necrosis refers to a rare condition in which there is paradoxical blood clotting. Blood clots block the blood vessels and cause necrosis, where an area of skin is destroyed. Warfarin-induced skin necrosis affects one in every 10,000 patients prescribed warfarin.
Vascular proliferations and abnormalities of blood vessels - DermNet
Prominent cutaneous blood vessels can be physiological or pathological. Blood vessels feeding a tumour such as basal cell carcinoma; A common sign of rosacea; A diagnostic feature of the CRST variant of systemic sclerosis; There are some named conditions in which telangiectasia is (or telangiectases are) characteristic.
Superficial thrombophlebitis - DermNet
Superficial thrombophlebitis is an inflammation of a superficial vein due to a blood clot and is found just under the skin. It most commonly affects the veins in the leg but can occur in other veins around the body, for example, on the arms, penis and breasts.
Heparin-induced skin necrosis - DermNet
These blood vessels are blocked by the clots so the surface skin does not receive an adequate blood supply and dies. Type III hypersensitivity syndrome (Arthus Reaction/Phenomenon) - immune complexes in the blood vessel wall may stimulate inflammation of the blood vessels (vasculitis), which then affects the blood supply to the surface skin.
Risks and complications of skin surgery - DermNet
Surgical site: forehead, scalp and eyelids often bruise more than other sites. A small amount of bleeding and bruising can be expected. Your surgeon will try to minimise this as much as possible during the procedure by either clotting small vessels using electrosurgery (cautery) or tying off bleeding vessels with a stitch / suture. Excessive ...