Which skin condition contraindicates the use of a suction machine?

The use of a suction machine is contraindicated for couperose skin because this condition is characterized by visible capillaries and redness, indicating fragility in the skin's microcirculation. Applying a suction machine to this type of skin can exacerbate the condition, potentially leading to increased redness, irritation, or further damage to the delicate blood vessels.

In contrast, oily skin may actually benefit from suction as it can help remove excess sebum and impurities, while dry skin, though it requires gentleness in treatment, does not typically have the same vascular concerns as couperose skin. Normal skin is generally suitable for a variety of treatments, including suction, since it does not display the same vulnerabilities as couperose skin does.