Noncicatrizing alopecias; with special reference to alopecia areata.

Since the epochal work of Hamilton there has been general acceptance of the causal relationship of the male sex hormone, age and familial inheritance in development of male pattern baldness. Some of the medicaments used in recent years may cause a diffuse loss of scalp hair. Alopecia that accompanies disease states is probably due to generalized toxemia and disturbances in metabolism. Sometimes male pattern baldness occurs in physiologic states, as exemplified by diffuse hair loss occasionally in the postpartum period. Alopecia areata deserves a critical appraisal, since it may be evidence of underlying neuropsychotic states that need psychiatric diagnosis and treatment. The development of alopecia totalis or universalis in 50 per cent of the prepuberal cases of alopecia areata is of real significance, especially since so very few patients recover their normal scalp hair. The conclusions reached by the authors of two articles reporting on 368 cases of alopecia areata, alopecia totalis and alopecia universalis that the evidence is overwhelming against the malfunction of the endocrine glands as the cause of alopecia areata must be considered real contributions to our understanding of this condition.A few conditions simulate alopecia areata. Probably the ones which are seen most often are trichotillomania and patchy baldness caused by agents used in hair waving and straightening. Our findings in 22 cases of alopecia areata of a persistent inflammatory perivascular and perifollicular infiltrate, massive plugging of the ostia, disappearance of robust hair follicles and diminution in total number of hair follicles and sometimes fibrosis are not necessarily diagnostic of alopecia areata but seem to be very definitely characteristic. Treatment for alopecia areata is of little avail. At this time we do not recommend the general use of the corticosteroids despite the improvement of scalp appearance in the majority of instances in which the systemic administration of these hormones have been employed.