HAS THERE EVER BEEN A RECORDED CASE OF A PERSON UNDER HYPNOSIS HAVING
BEEN TOLD(NOT ACTUALLY DONE)THAT A HOT OBJECT WAS BEING PLACED ON
HIS/HER SKIN, CAUSING A REAL BLISTER TO FORM WHILE THE SUBJECT WAS
UNDER HYPN0SIS?

Hello and thank you for your question.

The answer is yes - - there is a credible report of a burn blister
being induced under hypnosis.

"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
http://siivola.org/monte/papers_grouped/copyrighted/Misc/Herpes_Simplex_and_Second_Degree_Burn_Induced_Under_Hypnosis.htm

See also:
"Some of the most interesting hypnotic phenomena involve the apparent
precision production of subtle skin responses by suggestion. Allergic
reactions, pseudo-sunburns, blisters, and weals have been produced by
suggestion. In addition, it has long been known that certain highly
troublesome skin conditions have been influenced or healed in some
people by suggestion (with or without hypnotic induction)," citing:
Ullman & Dudek, 1960, "On the psyche and warts: II. Hypnotic
suggestion and warts," Psychosomatic Medicine, 22:68-76
Rulison, 1942, "Warts, A statistical study of nine hundred and twenty
one cases," Archives of Dermatology and Syphilology, 46:66-81.
Asher, 1956, "Respectable Hypnosis," British Medical Journal, 1:
309-312
R.F.Q. Johnson and T.X. Barber, 1976, "Hypnotic suggestions for
blister formation: Subjective and physiological effects," American
Journal of Clinical Hypnosis, 18: 172-181.
Mason, 1955, "Icthyosis and hypnosis," British Medical Journal, 2:
57-58.
M. Ullman, 1947, "Herpes Simplex and second degree burn induced under
hypnosis, American Journal of Psychiatry, 103: 828-830."

Hypnosis FAQ -- Section 2.7
http://www.hypnosis.com/faq/faq2-7.html
Hypnosis FAQ -- Section 6
www.psywww.com/asc/hyp/faq6.html 

Search terms used:
hypnotic blister

Thanks again for bringing us your interesting question.

Sincerely,
Google Answers Researcher
Richard-ga

Thank You........