1 doctor weighed in:

I have a rash that started on my neck and has spread to my back. It is NOT red. It is itchy and bumpy and has what looks like white heads inbetween. I used a hair growth shampoo. Could this be the cause? My scalp is not itchy at all

1 doctor weighed in
Dr. J. Lawrence Dohan
Dermatology

In brief: See a dermatologist

This is not due to the shampoo which you forgot to identify.
No shampoo makes hair grow more.

In brief: See a dermatologist

This is not due to the shampoo which you forgot to identify.
No shampoo makes hair grow more.
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