hi i think it is plantar hyperhydrosis .it may be congenital.infectious,menopause
and nutritional deficiency
.it presents as profuse sweating
of the feet .sometimes it is associated with palmar hyperhydrosis especially in congenital variety.it can be treated with vitamion e supplementation sprinkling absorb powder in the morning and applying aldry lotion over the plantar aspect cures it
if no response u can try iontophorosis .if still no response butox injections can be given.