"The black dots are the roots of fungal organisms. In order for the microbes to grow there must be food (plasticizer) and moisture (humidity). Whenever the humidity level rises about 70% the organisms will grow. When the humdity drops below 70% they will stop growing and wait for happier times!
The white dots are baby fungus. Before they mature to the point of developing chlorophyll (color) the organisms are white. A new colony is called a mycelial mat. Since the organisms are ubiquitious is appears that the spots are contagious. In fact if the conditions are right and a nutrient source is available, growth would take place no matter how many dolls are in a given location. Given that, I would not say that the microbial attack is the result of a contagious phemomenon." -Nick Hill, chemist