ERYTHEMA 



mentation is permanent. E. anni/ , , ~ 



multiforme in which the lesions shr*f e ' * ™ m ° f K 

 at the center, but continue to ex >k and desquamate 

 by a raised margin. It is also / nd at the P eri P he T 

 These rings may wander over the^ U . ed £-f l ™ na/um - 

 ing each other and forming elab entire . body ' intersect " 

 centic edges (E. gyratum) <f rate fi S ures Wlth cres " 

 develop concentrically around ^ ccaslonall y new rm g s 

 and varieties of color produce Dlder ones - Tbe forms 

 E. iris. E. bullosum < d give rise to the name 



circinatum. See E. ann. 



See E. vesiculosum. E. 



E. hypercemicum ; a mere ulare - E * congestivum, 

 simplest form of erythem ton g estlon of the skm ; the 

 significant in the conges ' a - Swellln S 1S absent or in " 

 ness varies from the b ted areas ' and the tint of red " 

 hue. E. endemic ^g^test red to a rosy or purple 

 demic. See Acrody hm - See ^llagra. E., Epi- 

 sub-acute non-cor nia - E - exudativum, an acute or 

 characterized b" ^ ta gi° us > inflammatory skin-disease, 

 distributed ra ; $ tne development of symmetrically 

 crete varyip J * se< ^ erythematous patches, usually dis- 

 by slight /e>1 g greatly in form and size, accompanied 

 rhage ^transudation of blood or by copious hemor- 

 ves' J ' U mto tbe skin, occasionally terminating as 

 .crvr lC i es or blebs, and specially liable to relapse. This 

 '"may be attended with constitutional rheumatic symp- 

 toms. E. figuratum, is marked by efflorescence in 

 gyrate lines. E. fugax, a variety of E. hypercemicum ; 

 it consists in a transitory redness of a patchy charac- 

 ter, suddenly appearing on the face and trunk of young 

 individuals and gradually disappearing in a few min- 

 utes or hours. It is frequently associated with indi- 

 gestion, worms, etc. E. furfuracea. Synonym of 

 Pityriasis rosea. E. gangraenosum, a term applied 

 to spontaneous patches of superficial gangrene or 

 ulceration seen chiefly in hysterical women. They are 

 undoubtedly self-induced, and are asymmetric, usually 

 on the left side, and in easily accessible positions. 

 E. gyratum. See E. annulare. E. hyperaemicum. 

 See E. congestivum. E. induratum, a variety of E. 

 exudativum attacking the calf, or the leg immediately 

 below, more frequently than the front of the legs. 

 It occurs either in diffuse, ill-defined patches or in 

 nodules, bright-red at first but gradually assuming a 

 violet hue. The nodules may be superficial or deep, 

 a quarter of an inch to an inch or more in diameter, 

 and may be slowly absorbed, or necrose and slough out, 

 leaving a very indolent ulcer. The condition is most 

 common in strumous individuals. E. intertrigo, inter- 

 trigo ; eczema intertrigo ; a chronic form of E. hy- 

 percemicum resulting from pressure or the rubbing to- 

 gether of folds of skin. It is common in infants and 

 fat adults. E. iris, Herpes iris. See E. annulare. 

 E. keratodes, a diffuse condition of tylosis of the 

 palms and soles. E. leve, a common skin-affection, a 

 variety of E. hypercemicum, likely to appear upon the 

 tense skin of dropsical parts. It may go on to derma- 

 titis and sloughing. E. marginatum, an infrequent 

 variety of E. multiforme, which generally begins as a 

 flat disc a quarter or half an inch in diameter, and very 

 rapidly enlarges at the periphery, subsiding pari passu 

 in the center. It joins similar adjacent lesions, and in 

 a few days traverses the circumference of a limb, or 

 a large area on the trunk, leaving a fawn-colored pig- 

 mentation that slowly disappears. E. multiforme, 

 E. polyitiorphe ; a variety of E. exudativum, common 

 in young adults of either sex, and appearing especially 

 in spring and autumn. The eruption first appears 

 almost invariably on the backs of the hands and feet 

 thence spreading to the forearms and legs. In severe 

 cases the trunk and face, and even the mucous mem- 

 branes may be affected. The lesions consist of flat or 

 slightly convex papules, sharply defined, deep-red or 



440 ERYTHRASMA 



purplish in color, varying in size from a pin's head up, 

 partially disappearing on pressure. This is the com- 

 monest form (E. papulatum). If the papules coalesce 

 to form larger lesions the condition is described as E. 

 tuberculatum. E. nodosum, dermatitis contusiformis ; 

 a further development of £. tuberculatum. Multiple 

 (seldom more than a dozen) raised, rosy patches, 

 round or oval in the direction of the limb, from one- 

 half to three inches in diameter, suddenly develop 

 along both tibiae, and often along the ulnar side of the 

 forearms. They are exquisitely tender, tense and shin- 

 ing. The condition chiefly occurs in children and deli- 

 cate young women. See Bacillus ofDemme under Bac- 

 teria, Synonymatic Table of . E. papulatum. See is. 

 multiforme. E. paratrimma, the erythema that ap- 

 pears over a bony prominence, etc. , immediately before 

 the formation of a bed-sore. It is a variety of E. 

 hypercemicum. E. pellagrosum. A synonym of 

 Pellagra. E. pernio. See Pernio. E. polymorphe. 

 See E. multiforme. E. purpuricum, Purpura throm- 

 botica ; a variety of erythema resembling Peliosis 

 rheumatica, but characterized by its erythematous ap- 

 pearance and the absence of alteration by pressure. It 

 is attended with no general symptoms, or with slight 

 pains in some of the joints, or with edema of the legs. 

 E. roseola, a variety of E. hypercemicum ; it consists 

 in the development of congestive patches of a delicate 

 rose-color, scarcely raised above the surface of the 

 skin, varying in size from a split-pea to a finger- 

 nail, and either diffused over the whole surface of the 

 body or in figured groups. It is common in young 

 children in association with digestive troubles. Its 

 different stages have been called Roseola infantilis, 

 cBstivalis, autumnalis, annulata, but these terms are 

 not now generally used. E. scarlatiniforme. a 

 variety of E. hypercemicum ; it appears as a vivid, 

 punctiform eruption , sharply defined in places, attended 

 with high temperature, often seen after injuries or sur- 

 gical operations. It is followed by furfuraceous des- 

 quamation. E. scarlatiniforme desquamativum, 

 a more pronounced form of E. scarlatiniforme, with a 

 greater tendency to be diffuse instead of punctiform, 

 of longer duration, and with a great liability to recur at 

 certain seasons. The mucous membranes are often in- 

 volved and desquamation occurs in large flakes. E. 

 simplex, a variety of E. hyperamicum ; characterized 

 by a congestive redness of moderate intensity. It 

 appears as diffuse or circumscribed, variously-sized 

 lesions, which are usually not raised above the integ- 

 ument. It may be idiopathic or symptomatic ; and 

 if the latter, brought about by a great number of 

 external irritants, including heat and cold, etc. E. 

 solare, E- simplex due to the heat of the sun. E. 

 tuberculatum. See E. midtiforme. E. tuberosum. 

 Same as E. tuberculatum. E. urticans, the early or 

 pink stage of the urticarial wheal. It is a variety 

 of E. hypercemicum. E. vesiculosum, the occur- 

 rence of vesication in the progress of E. multiforme. 

 If the blebs are large the condition is termed E. 

 bullosum. 



Erythematous {er-ith-em'-at-us) [epv8>/ua, a blush]. 

 Of the nature of erythema. 



Erythemoid (er-ith-em'-oid), Erythematoid {er-itk- 

 em'-at-oid) [kpv&r/iua, erythema ; ebhg, resemblance]. 

 Resembling erythema. 



Erythrasma (rr-ith-raz'-mah) [epvdp6r, red]. A rare 

 disease of the skin, always attacking the axilla' or in- 

 guinal regions, or the nates. It forms reddish 01 

 brownish, sharply defined, slightly raised, desquamat- 

 ing patches, that cause no itching or inconvenii 

 It is due to the microQrganism, Microsporon minutts- 

 simum, and is readily curable. 



