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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. [2] [3] The word is derived from Italian petecchia 'freckle', of obscure origin. [1]
White cells are larger than red blood cells and can be larger than the diameter of a capillary, so must deform to fit. As a large, deformed white blood cell goes through a capillary, a space opens up in front of it and red blood cells pile up behind. This makes the dots of light appear slightly elongated with dark tails.
The dots are white blood cells moving in the capillaries in front of the retina of the eye. [5] Blue light (optimal wavelength: 430 nm) is absorbed by the red blood cells that fill the capillaries. The eye and brain "edit out" the shadow lines of the capillaries, partially by dark adaptation of the photoreceptors lying beneath the capillaries ...
These rashes are often very red, macerated, and erosive-looking and are accompanied by red bumps or papules. Other symptoms to note : Candida rashes often have a “sour, yeasty odor,” Dr. Lal ...
Visual snow: dynamic, continuous, tiny dots observed across the entire visual field at any time of the day, regardless of lighting conditions, persisting for more than three months. The dots are usually black/gray on a white background and gray/white on a black background; however, they can also be transparent, white flashing, or colored.
Chiggers, a type of small mite, typically leave clusters of bites that are often very itchy. In many cases, chigger bites appear as small, red and itchy bumps. Sometimes, they can look like tiny ...
Red, itchy, scaly or oily rash; can also be weeping or leathery. Anywhere that came in contact with the irritant either directly or via transfer (e.g. from contaminated clothing.) Allergic purpura: Small red dots on the skin, or larger, bruise-like spots that appeared after taking medicine Anywhere Pityriasis Rosea
Speaking on behalf of the Citizen Continental-America Telescope Eclipse (Citizen CATE) 2024 project, Murphy said he and others were excited to see the solar prominence — those red dots — in ...