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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]
Subconjunctival bleeding initially appears bright red underneath the transparent bulbar conjunctiva. Later, the bleeding may spread and become green or yellow as the hemoglobin is metabolized. It usually disappears within two weeks. [5] The affected eye may feel dry, rough, or scratchy, but the condition is not usually painful.
A chalazion (/ k ə ˈ l eɪ z i ə n /; plural chalazia or chalazions) or meibomian cyst [4] is not a cyst but a granuloma [5] in the eyelid that results from a blocked meibomian gland. [6] [7] It typically occurs in the middle of the eyelid, red, and not painful. [2] They tend to come on gradually over a few weeks. [2]
The lacrimal caruncle is found at the medial canthus of the eye. [1] It consists of skin, hair follicles, sebaceous glands, sweat glands, accessory lacrimal tissue and other tissues that are present in the skin and accessory lacrimal glands.
Cherry angioma, also called cherry hemangioma [1] or Campbell de Morgan Spot, [2] is a small bright red dome-shaped bump on the skin. [3] It ranges between 0.5 – 6 mm in diameter and usually several are present, typically on the chest and arms, and increasing in number with age. [3] [4] If scratched, they may bleed. [5]
Red free photography is also regularly used as a base line photo prior to Angiography. [13] Angiography is a process of photographing/recording vascular flow within the retina and surrounding tissue by injecting a fluorescent dye into the blood stream. This dye fluoresces a different colour when light from a specific wavelength (excitation ...
Many photos Monday managed to catch a bright spot at the bottom of the eclipse. Murphy explained people were probably witnessing a "post eruptive solar prominence," which was likely the location ...
Blepharitis, sometimes known as granulated eyelids, is one of the most common ocular conditions characterized by inflammation, scaling, reddening, and crusting of the eyelid. This condition may also cause swelling, burning, itching, or a grainy sensation when introducing foreign objects or substances to the eye.