Blueheads

Blueheads were an extremely deadly virus contracted from Hepatitis Y patients. This virus caused its victims to grow large, neon blue boils on their faces, and transferred their skin to pale blue. These boils were extremely cold, and, if left untreated, would eventually freeze the patient's body completely, allowing it to shadder like fragile glass. The disease was the only known way to harvest Bluespill concetrated energy vacuoles (via extraction of Blueheadified corpses).