Signs and symptoms of compartment syndrome can be remembered as the 6 Ps, which are pain, paresthesia, pulselessness, pallor, poikilothermia and paralysis.
Voldemort stood up. Harry could see him now, see the red eyes, the flattened, serpentine face, the pallor of him gleaming slightly in the semidarkness.
Then a pallor of the skin can appear together with poikilothermia, which is the inability to regulate body temperature and usually presents as cold extremities.