A temporary burn pattern on the back of a lucky lightning-strike survivor.this patterns are recognized by forensic pathologists as clear evidence that a victim has been struck by lightning and the βtattoo β-although short-lived,normally just for a day or two-is caused by physical damage to capillaries under the skin .medical terms for this phenomenon include arborescent lighting burn ,arborescent (tree-like)erythema,keraunographic markings ,or ferning patterns