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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You may be a good candidate if: 1  You are at least 18 years old (21 for some lasers). The Food and Drug Administration has not approved lasers for Lasik on people younger than age 18 since their vision usually is still changing. 2  Your career plans permit it.