 [ Symptoms ] is shingles a single blister or a rash  my dad has a single red painful sore in his ear a pa asked if he had his zoster shot and now he is convinced he has shingles in his ear there are no other sores no rash just pain at the site and in his jaw in front of the ear [ Disease ] no thc can be detected by modern drug testing blood urine and hair for quite some time the only way to be sure that thc does not show up on a drug screening test is to not use cannabis