<unk>  is a clinical sign in which people with cocaine addiction experience paraesthesia which feels like a constantly moving foreign body, such as fine sand or powder, under the skin. The sign is named after Valentin<unk> .
Magnan's sign
Adson's sign
Piskacek's sign
Peabody's sign
Dance's sign
Hamman's sign
Kelly's sign
Budin's sign