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A petechia (/ p ɪ ˈ t iː k i ə /; [1] pl.: petechiae) is a small red or purple spot (≤4 mm in diameter) that can appear on the skin, conjunctiva, retina, and mucous membranes which is caused by haemorrhage of capillaries.
They measure 3–10 mm, [3] whereas petechiae measure less than 3 mm, and ecchymoses greater than 1 cm. [4] Purpura is common with typhus and can be present with meningitis caused by meningococci or septicaemia. In particular, meningococcus (Neisseria meningitidis), a Gram-negative diplococcus organism, releases endotoxin when it lyses.
A non-blanching rash (NBR) is a skin rash that does not fade when pressed with, and viewed through, a glass. It is a characteristic of both purpuric and petechial rashes. [ 1 ] Individual purpura measure 3–10 mm (0.3–1 cm, 3 ⁄ 32 - 3 ⁄ 8 in), whereas petechiae measure less than 3 mm. [ 2 ]
Subacute FES (non-fulminant FES) - The three characteristic features of fat embolism are present: respiratory distress, neurological signs, and skin petechiae. Petechiae are seen on the chest, axilla, shoulder, and mouth. [5] Occulsion of dermal capillaries by the fat emboli result in petechial rash. Petechiae rash occurs in 50 to 60% of the ...
The rash consists of numerous small, irregular purple or red spots ("petechiae") on the trunk, lower extremities, mucous membranes, conjunctiva, and (occasionally) the palms of the hands or soles of the feet. The rash is typically non-blanching; the redness does not
Various drugs can also induce pruritus which can manifest with or without a skin rash and can happen immediately or even months after the drug has been used by the patient. Neurological disorders such as postherpetic neuralgia, brachioradial pruritus and notalgia paraesthetica can also lead to senile pruritus with burning, stinging, scratching ...
Small bleeds into the skin cause the characteristic petechial rash, which appears with a star-like shape. This is due to the release of toxins into the blood that break down the walls of blood vessels. A rash can develop under the skin due to blood leakage that may leave red or brownish pinprick spots, [6] which can develop into purple bruising ...
The rash first appears two to five days after the onset of fever, and it is often quite subtle. Younger patients usually develop the rash earlier than older patients. Most often the rash begins as small, flat, pink, nonitchy spots on the wrists, forearms, and ankles. These spots turn pale when pressure is applied and eventually become raised on ...