If you were meditating and pursuing spiritual exploration or experiencing awakening I'd say its likely your are experiencing crown chakra activation. But it doesn't seem you are pursuing these things in particular so look to other possibilities.
Mint Shampoo will cause that, or perhaps another hair product?
Niacin causes some weird flushing in areas of the body (I think it's in the B vitamin family)
There's probably some other things to.
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