Hypnotize someone and tell them your finger is a lit cigarette and touch your finger on their arm. And their arm will automatically blister because their brain believed it.
You have any sources for that? Videos or something like a paper studying cases of it?
"On January 8, 1945, while under hypnosis, a second degree burn was
induced on the dorsum of the patient's left hand in the following
manner: Both hands were carefully examined and no abnormality was
noted. The patient was again made to re-enact his battle experience,
and at the point where the shell exploded he was told that a small
particle of molten shell fragment glanced off the dorsum of his hand.
Coincident with this, the examiner gently brushed the dorsum of the
patient's hand with a small flat file (of the type commonly used in
opening ampules). The file was at room temperature. There was
immediate pallor in a circumscribed area about one centimeter in
diameter at the point where the file made contact with his hand. After
a period of twenty minutes a narrow red margin gradually developed
about the area of pallor. Hypnosis was terminated at this point. On
awakening, the patient appeared puzzled and asked if he had been
smoking while asleep. He complained of pain in his hand and said that
he felt as if he might have burned himself with a cigarette. One hour
after the suggestion had been given early blister formation was
noted."
MONTAGUE ULLMAN, M. D., HERPES SIMPLEX AND SECOND DEGREE BURN INDUCED
UNDER HYPNOSIS
AMERICAN JOURNAL. OF PSYCHIATRY, Vol. 103, No. 6, May, 1947