Scalp injections are generally safe, but like any treatment, there can be some side effects. Most of these side effects come from the use of needles during the procedure: Swelling: One of the most common side effects is swelling at the injection site. This is a normal reaction to the needle punctures and usually subsides within a few hours. Bruising: Some people might notice small bruises where the injections were done. These typically fade within a few days. Mild Pain or Discomfort: The injection sites might feel a bit sore immediately after the treatment. Redness: The treated area might appear redder than usual, but this generally goes away within a day. Lastly, it’s important to avoid washing your hair or showering for at least three hours after the procedure. This allows the nutrients from the injection to be fully absorbed by your scalp, ensuring you get the most benefit from the treatment.