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Cancer is a numbers game. Unlike say, blackjack, you only know about certain risk factors. Many are unknown.

With skin cancer, getting a sunburn every two years triples your risk of developing melanoma. With the fairest skin types, even a single severe burn can increase risk if melanoma. Other skin cancers tend to result from constant exposure over time.

I don’t know much about this scenario with hair product. But if you have some other risk factors, it’s not unreasonable that a single exposure may result in a bad outcome.