Timber rattlesnake (Crotalus horridus) bite. Pit viper bites can cause a leakage of blood cells out of the blood vessels, even on parts of the body away from the bite site. Note the significant bruising of the upper forearm and arm.
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Age spots are harmless and typically show up on the face, hands, shoulders and arms, especially in people older than 40, according to the Mayo Clinic. A propensity toward age spots can be inherited, but typically the spots are caused by sun exposure; ultraviolet light increases the production of melanin.