The title is based on @Oddthinking's very helpful comment.
Bottom Left: Deeply Psychological Body Thing: While on the surface this may scan as a Skin Thing, the regular pattern of indentations made in this woman’s legs by what appear to be frozen peas or stones are in fact designed to trigger feelings of mild discomfort/anxiety amongst sufferers of Trypophobia, a common sensitivity to regularly occurring patterns of holes in surfaces — a discomfort that perversely elicits curiosity, playing on our fixation with the frailties of our bodies and our ultimate fear of death.
Do images that "trigger feelings of mild discomfort/anxiety amongst sufferers of" trypophobia2 elicit curiosity?
Or, as @Oddthinking says: Do "patterns of holes in surfaces [act as] surprisingly good clickbait - playing on our curiosity about mildly discomforting things?"
I couldn't find evidence for or against this. Maybe this statement is random and hasn't been researched?
2 Defined as "an intense and disproportionate fear towards holes, repetitive patterns, protrusions, etc." by Martínez-Aguayo et al..