peau d'orange

noun

peau d'o·​range ˌpō-ˌdȯr-ˈänj 

: thickened, dimpled skin that resembles the rind of an orange and is often associated with some forms of breast cancer

There was a mass, 6 to 7 cm in diameter, in the upper outer quadrant of the right breast … and the overlying skin had peau d'orange changes, without erythema.

—José Baselga et al., The New England Journal of Medicine