Freezer burn
From Halopedia, the Halo wiki
Freezer Burn, as it is known throughout the UNSC, is an injury caused because of or from cryopreservation in the cryo-bays of UNSC ships. During the freezing and resuscitation process, cloth or other material next to the skin causes cellular damage, resulting in large welts or rashes on the covered areas. Most UNSC personnel are stored in cryo either naked, or clothed and willing to endure the injuries. Spartans, for example, can be stored in cryopreservation fully clad in MJOLNIR armour without the effects dulling their combat performance. Its not known if this is because they simply ignore the injury, or if the advanced materials mean that they do not suffer from it.
