This study aims to investigate how a pimple patch with salicylic acid impacts the epidermis for pimple pus extraction. Pimple patches are used to treat acne and have grown popular due to their discreet nature and effectiveness. However, the mechanism of pus removal using these patches has yet to be fully understood. We seek to understand the relationship between salicylic acid and pus extraction to identify possible methods to optimize pimple patches for a more efficient and cost-effective treatment. In our model, salicylic acid is delivered to the skin via direct contact with the pimple patch, resulting in a concentration gradient that allows the acid to penetrate into the dermis. As salicylic acid diffuses from the patch into the skin, pimple pus is drawn out of the skin and into the patch by diffusion driven by a concentration gradient and capillary action. This allows the absorption of pus into the patch above the skin. We hypothesize that as the salicylic acid diffuses, the skin around the pimple softens and becomes more porous, allowing the pus to diffuse out of the skin more easily into the hydrocolloid patch. Using COMSOL, we have simulated the increase of pus diffusivity in the epidermis as salicylic acid from the hydrocolloid patch diffuses into the skin and the increase of pus diffusivity in the hydrocolloid patch as pus enters the patch. Based on our model, we have found that this particular pimple patch has room for improvement. In an 8-hour simulation, which parallels the typical duration a user wears a pimple patch, only a minimal amount of pus mass is removed from the skin. This demonstrates that pimple patches may not be the most effective means of pimple removal. However, since research on this topic is not readily available to the public, we anticipate that our model will be useful as a starting point for future pimple patch development.