If a cup is left on the skin for too long, especially during static cupping (when the cup stays in one place), the skin may react with a fluid-filled blister – similar to a mild burn or friction blister. This is the same kind of reaction the skin might have if exposed to prolonged pressure or irritation, such as from sunburn or rubbing shoes. The blister occurs because the vacuum pressure from the cup disrupts the microcirculation and creates too much localized strain, causing fluid to collect between the layers of the skin. It’s not dangerous, but it can feel uncomfortable.

Here’s how to care for your skin if a blister appears:

• Leave the blister alone. If it’s intact, don’t pop it. The blister protects the sensitive skin
  underneath.
• Protect the area if there’s a risk of friction, for example by using a breathable plaster or dressing that doesn’t stick to the blister.
• If the blister bursts or the area is painful, gently clean it with wound cleanser, apply an
  antibacterial ointment if needed, and cover with a sterile dressing.
• Contact a healthcare provider if the area becomes red, sore, oozes, or shows signs of
  infection.
• Avoid cupping on the affected area until the skin is fully healed, to prevent further
  irritation.

To avoid this in the future, limit cupping to just a few minutes per area and consider setting a timer. Always listen to your body – sometimes less is more.