Rather than razor-toothed piranhas, the fish are tiddlers that simply suck up dead skin -- but officials in Thailand and around the world have warned that blood in the spas' pools could pose serious hygiene problems.
However customers are continuing to patronize the fish spas, shrugging off any talk of danger.
Some fish spa fans stricken with gout, psoriasis, eczema, bunions and other ailments have insisted the fish cured them, giving rise to widespread debate and online first-person testimonies about the treatment's benefits and dangers.
Most establishments throughout the world use toothless Garra Rufa, also known as "doctor fish," though some places describe their fish as toothless carp or Cyprinion Macrostomus.
Earlier this month, Thailand's Public Health Ministry advised people who have injuries on their skin not to use fish spas.
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