PITYRI'ASIS (from the Greek word pityron, bran) is the term given to one of the squamous or scaly deseases of the skin, in which there is a continual throwing off of bran-like scales of epidermis, which are renewed as fast as they are lost. It may occur upon any part of the body, giving rise to brown patches, in which there are sensations of itching, tingling, or pricking. It is more easily cured than the other scaly diseases, and its removal can generally be effected by the frequent use of the warm bath; or, if it fails, recourse may be had to alkaline or sulphur baths; due attention being at the same time paid to the general health. It sometimes occurs on the scalp, when it is known as (tan ctriff, and must be treated with weak alkaline lotions, or, if these fail, with tar ointment, provided there is no inflammation. There is a variety known as pity•iasis vereicolor, which is probably due to the presence of a parasitic fungus, the mierosporon furfurans; but whether the fungus is the positive cause of the disease, or only an attendant on it, finding a suitable Indus in the diseased epidermis, is not certain. This variety may be
detected by a microscopic examination of the exfoliated scales, when the spores and filaments of the fungus will be detected. The treatment of this affection must be solely local. Dr. Watson mentions a case which yielded at once to a cbuple of sulphur baths. Probably the best remedy is the application of a saturated watery solution of sulphurous acid gas, or of one of the sulphites dissolved in diluted vinegar.
PII:1 (in Ital. more), as a musical term, when prefixed to another word, intensifies its meaning—e.g., phi mosso, with more movement.