10 Phenylketonuria Symptoms

By sarah-jane
Reviewed: dr. vanta
Article Sources Article Sources
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Medical Expert Medical Expert

Light Hair

Light hair is a possible physical symptom of phenylketonuria. As with skin tone, melanin is responsible for the color of hair. People with phenylketonuria have lower levels of melanin, which typically causes them to have lighter hair than other family members.

While babies may be born with no hair, their natural hair color has already been programmed into their DNA code before birth. Children with phenylketonuria commonly have very light blond hair.


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