It’s best to avoid colouring, bleaching, perming or applying chemical straightening treatments in the few days leading up to your PRP session. These processes can irritate the scalp, cause inflammation and leave the skin more sensitive. If PRP injections are performed on already irritated or chemically stressed skin, it may trigger discomfort, prolonged redness or temporary inflammation. Ideally, schedule your colour or chemical treatment at least 3–7 days before your PRP appointment. The goal is to ensure your scalp is calm, clean and free of chemical residues so the PRP can penetrate and activate the follicles effectively.