PHLYCTENA (phlyctaena; Greek phlyktaina a blister, a bubble) — the superficial flat bubble with a diameter from 0,5 to 1 cm with a thin flabby not intense tire surrounded with a narrow nimbus of a dermahemia.
349 F. are usually observed at superficial acute or chronic streptococcal damages of skin (see Impetigo, the Pyoderma). At gistol. research F. existence under a corneous layer of skin of the single-chamber cavity which is not tied with a hair follicle filled with the serous exudate consisting of fibrin, a small amount of leukocytes and epithelial cells which underwent dystrophy is noted. In the cells of an acanthceous layer forming a bottom F., intercellular hypostasis is noted; vessels of a papillary layer of a derma are expanded, there is an insignificant perivascular inflammatory infiltrate from neutrophils and lymphocytes. In a regional part of a bubble under a tire the streptococci (one or in a combination to stafilokokka) which are located vnekletochno or in neutrophils often are found.
At an acute current F. can merge, forming the centers of defeat, considerable in size, with krupnofestonchaty outlines. In several hours F. the surface wet bright pink erosion which is plentifully separating exudate is opened, forms to-ry dries up in crusts. After permission F. temporarily the hyperemia and a xanthopathy remain. T. can be formed also on mucous membranes of lips, cheeks, a hard palate, language, a nose.
In ophthalmology the term «phlyctena» designate the small knot which is formed on a conjunctiva of an eyeglobe or in surface layers of a cornea, consisting of lymphocytes, eiitelioidny, and sometimes and colossal cells (e.g., at a fliktenulezny and scrofulous keratoconjunctivitis).
O. K. Shaposhnikov.