Experimenting a little with digital-only rendering, and for whatever reason thought of using miniature kotatsu Marisas as a substitute for those heated stone massages.
technically manjuus (yukkuris) skin is made of flour and wouldn't melt with just a little bit of water from sweat. They are, after all, "steamed buns". If they melted from sweat they'd all die in a hot summer's day.
The fanon canon way of "melting" away is more like when you soak a piece of bread in water. With a little bit of water, nothing happens. But if you dose it in water, the integrity of the bread becomes very weak and is prone to tearing. When you leave it in water, the whole thing disintegrates after a while.