Want fewer wrinkles or plumper lips or cheeks? Don’t use “needle-free” injectors or “pens” that use high pressure to force fillers (like hyaluronic acid) into your skin, warns the FDA.

Using needle-free devices—sold without FDA approval on Amazon and elsewhere—can cause bleeding, scarring, infections, discolored skin, lumps under the skin, eye damage, allergic reactions, or blocked blood vessels, which can lead to tissue death, blindness, or stroke, says the FDA.

What to do

Avoid needle-free “pens.” Dermal fillers should only be injected (with a needle) by a licensed provider with training in dermatology or plastic surgery, says the FDA.