490 DISEASES OF THE SKIN 



EPITOME OF ETIOLOGY (Morris). 



Tinea tonsurans is mostly due to M. audouini and to the endothrix 

 trichophytons, but the scalp, and especially the juvenile scalp, may be 

 attacked by a great many of the fungi of both families. 



The beard is attacl'ced by trichophytons only. 



The hairless skin is seldom affected by microsporons. 



The nails are rarely involved ; in such cases the parasite is the 

 T. acuminatum or T. violaceum. 



Adults are scarcely ever attacked except by endo-ectothrix tricho- 

 phytons, which group is also responsible for much of the ringworm 

 of the hairless parts. 



VARIETIES. 



(1) T. alba. 



Parasite, T. macfad3'eni. 



Attacks the arms, legs and any part of the body. 



Lesions are white, oval or irregular patches, margins slightly 



elevated and sometimes dotted with papules. 

 It is a form of dhobie itch. 

 Treatment. — Chrysarobin ointment, 2*5 per cent., and tincture 



of iodine. 



(2) T. albigena. 

 Parasite, T. albicans. 



Attacks the palms and soles especially, also the nails, forearms 



and legs. 

 Lesions, bullae which rupture, followed by a profuse keratosis 



until the palms and soles thicken considerably. 

 White patches may develop on the leg and arm. 

 Treatment as above. 



(3) T. barbae (Sycosis). 



Parasite, endo-ectothrix trichophytons from animals or 



children, shaving brushes, &c., less often. 

 T. acuminatium, violaceum and nodoformans. 

 Attacks the beard area, mostly confined to young male adults. 

 Lesions, itching, chronic, scaly eruption, sometimes gyrated 



or pustular. In simple cases the hair is not damaged ; in 



severe cases the hair is permanently destroyed. 

 Treatment. — Perseverance is essential for a cure. 

 X-rays where possible if there is no suppuration. 

 Epilation with forceps. 

 Chrysarobin and sulphur ointment. 

 All barber's instruments to be sterilized thoroughlv each time 



thev are used. 



