Ans.
Pimples represent hard, small inflamed spots on the skin, due to a variety of causes, such as by bacterial infection. Sebaceous glands present inside the skin pores release sebum or oil that gets accumulated in the pores and cause blockage.
It allows bacterial growth in the pores that causes infection and inflammation that leads to development of pimples. Our skin releases small microbial peptides and natural oils that inhibits the growth of infectious bacteria as a defense mechanism.
Thus, Maria is getting pimples because the soap removes the natural oils that inhibit bacteria, while the cold water left the oil on skin that cause blockage of pores and pimples.