Bleeding and bruising - DermNet
2017年8月14日 · A bruise, also known as ecchymosis or a contusion, occurs when small blood vessels (capillaries) under the skin bleed, while the overlying skin remains intact. The injury causes blood to leak and collect near the skin surface, causing bluish-black skin discolouration.
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 (vasculitis)
Senile purpura - DermNet
Senile purpura is a common, benign condition characterised by the recurrent formation of purple ecchymoses (bruises) on the extensor surfaces of forearms following minor trauma. It is also known as Bateman purpura, after British dermatology pioneer Thomas Bateman, who first described it in 1818; and actinic purpura, because of its association ...
Cellulitis: Symptoms, Causes, Treatment and more - DermNet
Cellulitis is a common bacterial skin infection of the lower dermis and subcutaneous tissue. It results in a localised area of red, painful, swollen skin, and systemic symptoms. Left untreated, cellulitis can be life-threatening. Similar symptoms are experienced with the more superficial infection, erysipelas, so cellulitis and erysipelas are ...
Achenbach syndrome: Painful Blue Finger - DermNet
Achenbach syndrome has been predominantly reported in middle-aged females, with a median age of onset of 48–50 years (range 22–76). Although said to be rare, a study of 802 members of the general population aged 18 to 84 years in three regions of France found a prevalence of 12.4% in women and 1.2% of men. It is possibly more common in ...
Skin manifestations of haematological diseases - DermNet
Skin manifestations are: Maculopapular cutaneous mastocytosis (tan/brown papules in children, reddish-brown macules and papules in adults). Also known as urticaria pigmentosa. Darier sign (erythema and urticaria when affected skin is rubbed) Pruritus. Mastocytomas (rare in adults)
Different causes of purpura – 10 cases - DermNet
Different causes of purpura – 10 cases. This quiz tests your ability to recognise different causes of purpura. Purpura is due to haemorrhage from small blood vessels, and there is as wide differential diagnosis. Petechiae are small, purpuric lesions up to 2mm across, and ecchymoses or bruises are larger. Extravasated blood usually breaks down ...
Ichthyosis - DermNet
Ichthyosis vulgaris (1:250—1000) has an autosomal dominant inheritance, meaning an abnormal gene is inherited from a parent. Penetrance is 90%. Onset is delayed until at least three months of age. Recessive X-linked ichthyosis (1:2000—6000) mainly affects males, who have a single X chromosome with the abnormal gene.
Common skin lesions. Dermal and subcutaneous lesions
Angiosarcoma usually arises on the head and neck, or arise in areas of chronic lymphoedema such as after mastectomy. It presents as an advancing area of purpura and ecchymosis, usually in an elderly person. Prognosis is poor as the tumour is often multifocal so difficult to excise, and only partially sensitive to radiation.
Terminology in dermatology
Fibroblasts — cells found in the dermis that produce collagen, elastin, ground substance and fibronectin (a glycoprotein). Nerves — sensory and autonomic fibres with distinct nerve endings for touch, heat, cold, pressure and pain. Blood vessels — arteries, arterioles, capillaries, venules and veins carrying blood to and from the skin.