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I have long thin blue streak on left side of scalp

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3191940 tn?1447268717
How long has it been there? It could be an allergic reaction to a product you're using, but there are many possible causes.  https://www.aad.org/public/diseases/hair-and-scalp-problems/scalp-itch

If you don't find relief using some suggestions for changing products or rinsing thoroughly, or if it continues to grow, I'd definitely see a doctor.
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Thank you.  Will do
Avatar universal
It's been here off & on for maybe 1-2 years.  But it only bothers me at certain.  I cant brush hair hardly.  Its itchy & very painful.  2 days ago I had blurred vision all day & kinda bad.
I have hypothyroidism.  And digestive illness.  For last 2 years I have been to doctors, have had procedures, suffer from headaches, but that was for years as long as I can remember.
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Had  Samanella 2017 in Jan.   In hospital force days.
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