Sulfur may also interact with the oxygen radicals in
the deeper layers of the epidermis, producing sulfur
and disulfur hydrogen, which may in turn be transformed
into H2S5O6; this may be the source of the
antibacterial and antifungal activity of sulfur water.11
Histological alterations of the skin caused by baths in
sulfur waters have been described. They include hyperkeratosis,
parakeratosis, and keratolysis that occur at
different concentrations of sulfur ions. After sulfurous
baths, dermal vessels are dilated and surrounded by a
perivascular infiltrate of mononuclear cells