Which condition would contraindicate the use of a derma roller treatment?

The use of a derma roller, which involves microneedling to stimulate collagen production and improve the texture of the skin, is contraindicated in the presence of active acne. This is because performing microneedling on inflamed or infected skin can exacerbate the condition, potentially spreading bacteria and leading to further inflammation or worsening of the breakout. Active acne indicates a current inflammatory process; introducing needles into this area could create channels that allow bacteria to penetrate deeper into the skin.

In contrast, minor scars can actually benefit from derma rolling, as the treatment is designed to promote healing and improve the appearance of scars. Dry skin may require additional hydration but is not an outright contraindication; the treatment can be adjusted to suit the skin type. Sunburn, while not ideal for treatment, may still be considered with caution if adequately healed, but active acne presents immediate risks that necessitate avoiding derma rolling altogether.