Want all the biggest Lifestyle news straight to your inbox? Sign up for our free Daily Star Hot Topics newsletterHe said: "There is no scientific evidence to support the claim that having COVID alone increases an allergic reaction to hair colour or any other hair and beauty treatments."An allergic reaction can occur at any time due to a number of factors of which a compromised immune system is one."The NHBF industry protocol is to test every client every six months, even if the client has not changed their colour choice or service, but if clients change colour or shade, goes to a new salon, or if they or a hair and beauty professional have any concerns, we recommend testing at every appointment."This should be done at least 48 hours before.
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