  Pimple is one of the most common skin diseases for humans. The mechanical
modeling of pimple growth is very limited. A finite element model is developed
to quantify the deformation field with the expansion of follicle, and then the
mechanical stimulus is related to the sensation of pain during the development
of pimple. Through these models, parametric studies show the dependence of
mechanical stimulus and pain level on the pimple-surrounded structures,
follicle depth and mechanical properties of the epidermis. The findings in this
paper may provide useful insights on prevention or pain relief of pimples, as
well as those related to cosmetics and other tissue growth.
