466 DISEASES OF THE SKIN 



DERMATITIS MACROGYRATA. 



A condition of large persistent, scaly, crusty gyrations upon the 

 palms met with in Southern India. The cause is unknown. 

 Treatment has not been found efficacious. 



DERMATITIS NODOSA RUBRA. 



A general eruption of large, hard, angry red papules without 

 umbilication or scales. The pruritus is almost unbearable. 



The disease may last six to twelve months and then clear up 

 spontaneously. 



It resembles the papular stage of small-pox, but there is no fever 

 and no scarring. The causation is unknown. 



Salicylic-alcoholic lotions, 2 per cent., are useful. Internal 

 medication has not improved the condition. 



DERMATITIS RIMOSA OF THE TOES. 



A condition of severe pruritus, followed by the formation of fissures 

 between the toes. The condition is dif^cult to cure. 



Warm carbolic foot baths and zinc oxide powder will assist much. 



DERMATITIS SOLARIS. 



This is an advanced condition of erythema solare. 

 Avoid exposure to the sun. 



DERMATITIS VENENATA. 



An inflammatory condition of the skin caused by contact with 

 certain poisonous plants and timbers. 



The following classification has been suggested by Castellani :- — 



(1) The Rhus Group. 



Plants in wliicii the poisonous principle is contained in a clear 

 watery fluid, e.g., poisonous ivy, the varnish tree, parsnips, &c. 



(2) The Euphorbia Group. 



Plants in which the poisonous principle is contained in a thick 

 milky fluid, e.g., the manchineel tree and all Euphorbias. 



(3) The Urtica Group. 



Plants in which the poisonous principle is contained in the fluid 



of special hairs, e.g., nettles, primroses, &c. 

 (4<) The Fectona Group. 



Dried hard woods, the dust of which contains the poisonous 



principle, e.g., teak, satin-wood, ebony, rosewood, &c. ^ 



For treatment lead lotion and calamine lotion should be applied. 



DERMATOPHILIASIS. 



This is a local skin disease due to invasion by the pregnant female 

 jigger, Dermatophilus penetrans. 



