Which skin condition prohibits the use of a suction machine?

The skin condition that prohibits the use of a suction machine is couperose skin. Couperose skin is characterized by the presence of small, visible blood vessels and redness, often due to increased vascularity or fragility of the blood vessels close to the skin's surface. Using a suction machine on couperose skin can exacerbate these issues by increasing blood flow and potentially causing further irritation or damage to the delicate capillaries.

In contrast, normal, oily, or dry skin typically does not present the same risks and can often tolerate various treatments, including suction methods. Normal skin is balanced and generally does not have any specific sensitivity, while oily skin can benefit from suction to remove excess oil and impurities. Dry skin, though requiring gentler treatment, typically does not have the vascular fragility seen in couperose skin that would contraindicate suction usage.