Most clients experience no side effects other than a feeling of warmth during treatment and a mild warming sensation after treatment. However, possible side effects may include a feeling of warmth and/or slight pain during treatment, redness of the treated skin around the nail lasting 24 – 72 hours, slight swelling of the treated skin around the nail lasting 24 – 72 hours, discolouration or burn marks may occur on the nail. In very rare cases, blistering of the treated skin around the nail and scarring of the treated skin around the nail may occur.