Pregnant, Breast-feeding, Nerve disorders e.g. diabetic neuropathy, Inflammatory skin disorders, Skin conditions caused by immune system disorders e.g. eczema or psoriasis, Raynaud's phenomenon, Cryoglobulinemia, Paroxysmal cold hemoglobinuria, Cold urticarial, Cold agglutinin disease, Have a pacemaker or defibrillator, Abnormal tissue growth, such as being prone to keloid scarring, blood clots, cancer, heart disease or other heart conditions, Insulin-dependent diabetes, liver disease or other conditions, Multiple sclerosis, Implants, A vascular condition or If you’ve recently had surgery or take anticoagulants or medications that make you light sensitive