Purple toe is a condition where there might be bruising of the toe, or there might not be enough oxygen supply to the toes, which leads to discoloration of the skin. The condition is caused due to foot injuries, Raynaud's disease, lupus, peripheral artery disease, diabetes, frostbite, etc. If the discoloration is caused by injuries, treatment of the injury will resolve it. Otherwise, the underlying cause has to be identified and treated.
Hello, Welcome to icliniq.com. I understand your son had an injury and has knee pain. Change in color when compared to the other foot is not normal.
Hello, Welcome to icliniq.com I saw the picture attached (attachments removed to protect the patient's identity). It seems like it is a secondary Raynaud phenomenon.
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