Keratin treatments are generally safe and do not have significant side effects. However, some people may experience mild irritation or sensitivity to the ingredients in the treatment. This is more likely to occur in people with sensitive scalp or skin or those who are allergic to one or more ingredients in the treatment. Suppose you experience adverse reactions after getting a keratin treatment, such as redness, itching, or swelling. In that case, it’s important to contact a healthcare professional or the salon where the treatment was performed. In rare cases, keratin treatments can cause more serious side effects, such as difficulty breathing or chest tightness. If you experience these symptoms, seek medical attention immediately.