What condition in breastfeeding mothers is characterized by red, shiny skin that itches and may flake?

The condition described in the question is more accurately identified as contact dermatitis. In breastfeeding mothers, contact dermatitis can manifest as red, shiny skin that itches and may flake, often resulting from an allergic reaction to soaps, lotions, or even the materials in nursing bras.

Thrush, on the other hand, typically refers to a fungal infection caused by Candida, which can affect both the oral cavity of infants and the nipples of breastfeeding mothers, leading to a painful, burning sensation rather than just a red, shiny skin appearance.

Mastitis is an infection of the breast tissue that leads to inflammation, and it usually presents with symptoms that include redness, swelling, and warmth, along with pain in the breast.

A breast abscess is a localized collection of pus in the breast tissue that usually arises from untreated mastitis and can present similarly with pain, swelling, and fever, but it does not primarily cause dry, flaky skin.

Thus, the characteristics described in the question align most closely with contact dermatitis, making it the correct choice.