838 Dandruff. Erythema. 



scales, a greasy mass surrounds tlie origin of the hair shafts, 

 which now and again mats several hairs into a tuft. Slight 

 itching may at times be present, and eventually the hair ^\'ill 

 fall out. 



Seborrhoea oleosa develops, as a. rule, on parts of the body 

 that are thickly covered with hair, but at times also in groin, in- 

 side the thighs or inside of the ears (Schindelka). The skin feels 

 greasy or an oily substance may be scraped from it. The fatty 

 substance, which is secreted copiously, dries to yellowish gray 

 crusts under which the skin appears otherwise unchanged. 



In sheep the neck, back, shoulders and sides of the breast 

 are attacked mostly by seborrhoea sicca (socalled false scab), 

 which form into small or large whitish yellow and later brown- 

 ish yellow greasy scales or lamellae (socalled tallow scab). Fall- 

 ing out of the wool occurs later. Itching does not occur, but the 

 animals tear out the wool at the affected spot (Haubner). 



Seborrhoea oleosa occurring on parts not covered with wool 

 exhibits similar s^Tiiptoms to those seen in the dog. 



Course. The disease runs a rather slow course and unless 

 treated does not improve except with some moderation in sum- 

 mer. Suitable treatment causes it to decline after the lapse of 

 several months. In horses it sometimes leads to exhaustion of 

 the patients. 



Diagnosis. Seborrhea may be distingiiished from eczema, 

 scab or acariasis, because in these affections the skin itself is 

 more or less changed, and scab is associated with evident itch- 

 ing. Scab and acariasis occur moreover often at first on dis- 

 tinct parts of the body, and on microscopic examination the 

 mites are to be found there. 



Treatment. Good nourishment, care of the ski'^i, and if 

 necessary, clipping of the hair, and the removal of any under- 

 lying disease, if such be discovered, usually lead to recovery. 

 In dry seborrhea applications of vaseline or lanoline are indi- 

 cated as well as washing with alkaline solutions or, in case of 

 considerable itching, dressing with glycerinated salicylic acid 

 (1 part of salicylic acid, 3 parts of glycerine, 60 parts of alcohol 

 [Frederiks]). In other cases the disease is influenced favorably 

 by the empio^mient of a 5 to 10% resorcin or salicylic ointment. 

 In obstinate cases the treatment must be continued for a month 

 or over. 



Literature. Dorst, Z. f. Vk., 1906, 437.— Moussu, Eec, 189S, 81.— Eossi, D. 

 t. W.. 1004, 104 (Eeview).— Roder, S. B., 1903, 293.— Schindelka, Hautkrkh., 1908, 

 70 (Lit.). 



5. Erjrthema. 



By erythema is understood a reddening of the skin through 

 a copious filling of the blood capillaries of the superficial layers 



