DEAR DR. ROACH: I was interested in reading your recent column on the causes of psoriasis. My mother suffered from it since the age of 9. It was on her legs, elbows, head and pubic area. I cannot stress enough the influence of stress on this condition. When she was quite old with dementia (perhaps Alzheimer's?) and she had no stress and no memory, her lifelong psoriasis completely vanished. -- B.A.S.

ANSWER: Thank you for writing, and I think it is fascinating that your mother's psoriasis went away. One type of psoriasis -- called "guttate," which means "droplike" -- can sometimes go away after a few months, but resolution after a lifelong course is not something I have read about. A brief search of studies did not reveal a correlation with dementia. I am curious if others, especially my dermatology colleagues, have clinical experience with this. If so, please write to me.

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