Instances of localized hyperhidrosis are rather infrequent, if one is to judge from the published case reports. The etiology is more or less problematic, although, according to the conclusions of Biedl,1 hyperexcitability of the so-called "sweat fibers" of the peripheral nerves and of the parenchymatous cells of the coil glands plays an important part in the phenomena of excessive sweat production.
The following case of hyperhidrosis is of interest chiefly because of the location and slight extent of the area involved, the early, or possibly congenital, development of the condition, and the excellent general physical appearance of the patient.
—C. S., a boy, aged 6, was referred to me by Dr. W. T. Reynolds, of this city. He is an only child, and the cutaneous history of the family is negative. The birth was a normal one, and the patient's health has always been good. There is no history