The Dermatoses excited by ingested aliments and medicaments are next to be considered. Here an inherited or acquired vulnerability often comes into play. It is well known that certain articles of diet disagree temporarily or persistently with some people, e.g. strawberries, or tea or coffee, and again certain foods may on occasion contain special poisons, as diseased maize, mussels, tinned foods and pies.
The second class of Group I comprises the numerous and important diseases excited by animal and vegetable parasites. Some are superficial and unassociated with any toxic poisoning which we can trace, such as the mould parasitic affections of the epidermis, and it is not known that diet can in any way influence the growth of the parasites, although certain local conditions favour their growth. For instance, the microsporon loves the child's hair, and the parasite causing tinea versicolor likes covered warm perspiring parts of the body, and it thus not infrequently attacks delicate people who clothe warmly, such as those predisposed to tuberculosis. Hence the presence of this disease may give a hint for good feeding to improve the general nutrition. Of the microbic infections streptococci, causing the common impetigo contagiosa, and the so-called pemphigus neonatorum, and staphylococci causing the pustular impetigo, boils and carbuncles, may set up a notable toxic poisoning, and rarely a general infection. There are qualities of the soil which offer a diminished resistance to the growth of these organisms, which may vary in virulence, and therefore it is important in addition to the specific treatment to strengthen the nutrition by plenty of good food. The existence of diabetes or glycosuria is well known to favour the growth of staphylococci, and demands the appropriate dieting for these conditions. Though the proof of its parasitic nature is not absolutely assured, I mention here the very common phases of pityriasis of the scalp and other parts including the "flannel rash," states nowadays often described as eczema seborrhoeicum or seborr-hoeides. I do not recognize that any special diet influences these eruptions. Then we come to the more formidable infective granulomata, such as tuberculosis, syphilis and leprosy. There is no special diet indicated in these infections, but a building up, as far as possible, of the general nutrition. Modifications are of course called for in different stages, such as acute febrile phases, implication of important organs, and so on.