You should not have PRP if you have any of the following concerns: Skin diseases: Skin cancer, Porphyria, dermatological conditions affecting the facial skin Blood disorders: platelet abnormalities, anticoagulation therapy (eg warfarin) Undergoing chemotherapy. You should make us aware if any of the following apply to you: Platelet dysfunction syndrome Haemodynamic instability Critical thrombocytopenia Hypofibrinogenaemia Sepsis Haemodynamic Instability Chronic Liver Disease Hepatitis Acute or Chronic diseases Also, let us know if you have taken any of the following in the 14 days prior to treatment as they can cause a blood-thinning effect: Vitamin E Fish oil supplements