<prompt> Tactile hallucinations are noticed inParkinsonismChronic depressionChronic cocaine poisoningAcute barbiturate poisoning  <response>: Magnans Syndrome Cocaine Bugs This is seen in cocaine addicts. It is a type of tactile hallucination. There is a feeling as if grains of sand are lying under the skin or small insects are creeping on the skin giving rise to itching sensation formication. 