All of the following may cause ingrown hairs EXCEPT:

Ingrown hairs occur when hair grows back into the skin rather than rising up from it, resulting in inflammation, irritation, or even infection. Regular exfoliation is a process that helps to remove dead skin cells and can prevent hair follicles from becoming clogged. By promoting cell turnover and keeping the skin smooth, exfoliation allows hairs to grow outward properly rather than getting trapped beneath the surface of the skin.

In contrast, excessive close shaving can lead to hairs being cut too short, increasing the likelihood of them curling back into the skin. Excessive pressure during shaving may also irritate the skin and lead to ingrown hairs. Furthermore, the improper use of tweezers, razors, or trimmers can distort hair growth or lead to skin damage, both of which contribute to the potential for ingrown hairs. Regular exfoliation is protective and beneficial, distinguishing it from the other options that can all contribute to the issue of ingrown hairs.