470 DISEASES OF THE SKIN 



Any pressure of the temporal arteries or veins of the scalp 



by hard unventilated hats. 



Profuse perspiration with bacterial invasion and decomposition 



of the hair. 



Chronic seborrhcea, and a 



Neurosis when it is local and follows the track of some nerve. 



TREATMENT. 



To remove the cause, e.g., clear up the syphilis, treat the 



febrile or general disorder, remove the pressure on the vessels, 



correct the nutrition, &c. 



Stimulate the blood supply of the scalp locally with mild 



irritant. 



Nourish the follicles externally by ointments. 



External Irritants. — There are endless varieties. A good 



one is : — 



R Borate of soda 



Salicylic acid 



Tinct. of cantharides ... 



Bay rum... 



Rose water 



Boiling water to ih pints. 



Nourishing Ointments. — A good one is : — 



^ Acid salicyl ... 5 grains 



Sulph. praecipitat. ... ... ... ... 15 ,, 



Beta-naphthol ... ... ... ... ... 10 ,, 



Vaseline to one ounce. 



(2) Canities. 



A senile change usually causes greyness, but the condition 

 of grey hairs may be congenital, the result of disease, nervous 

 shock, or long-continued nervous exhaustion. 

 In elderly persons, treatment other than dyeing is useless, 

 while in younger persons cure is very doubtful. 

 Black hair may result from pilocarpine injections given for 

 any reason. 



Aniline dyes will cause a deep red brown colour of the hair 

 in some dye workers. 



Green hair is caused by copper amongst copper smelters. 

 Blue hair is caused amongst workers in cobalt mines. 

 For the treatment of grey hair in young persons the follow- 

 ing can be tried : Tinct. of jaborandi, internally, 15 minims 

 t.d.s., or pilocarpine hydrochlorate, hypodermically, gr. ^^ to . 



(3) Dermatitis Papillaris Capillitii. 



An inflammatory process, commencing on the back of the 

 neck and spreading upwards. The papules form large rasp- 



