What condition can cause redness and bumpiness on arms?

Keratosis Pilaris is the correct answer as it specifically describes a condition characterized by small, red or skin-colored bumps that often appear on the upper arms, thighs, and sometimes on the face. This condition occurs when there is a buildup of keratin, a protein found in the skin, which leads to the formation of these rough patches. The bumps can also be accompanied by redness in the surrounding area, which contributes to the overall appearance of irritation.

This condition is generally harmless and often resolves on its own, but can be treated with exfoliating agents or moisturizers to help smooth the skin's texture. Understanding keratosis pilaris is important for recognizing the signs and implementing appropriate care strategies, especially in esthetics practice where skin conditions frequently come into play.

Other conditions listed do present with redness or bumps, but they differ in their characteristics and usual locations; for example, acne typically presents with pustules, cysts, and can be widespread, while eczema usually involves patches of itchy, inflamed skin, and tends to appear in different locations and have a different texture. Rosacea is primarily characterized by facial redness and visible blood vessels, not a generalized bumpy texture on the arms.