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Abnormal skin sensations are very annoying. It is even more annoying, when you are unable to explain it. One such skin sensation that feels like ants or insects crawling on your arms and legs, underneath the skin is known as Formication. Formication or the sensation of ants and other insects or sometimes even the sensation of reptiles crawling on the arms and legs, underneath the skin, is considered to be a tactile hallucination. It is believed to be a side effect of several disorders.
