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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1 These are also known as liver spots or age spots. They are found on 90% of people over the age of 60, and are caused but exposure to UV rays.  Post-inflammatory hyperpigmentation (PIH). This is caused by skin injury such as psoriasis, burns, acne, and some skin care treatments.