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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Use lemon juice. Lemon juice contains citric acid, which can help to bleach age spots. Simply dab a little fresh lemon juice directly onto the sunspot and leave to sit for 30 minutes before rinsing off. Do this twice a day and you should start to see results in a month or two.