Hi Dear, Welcome to HCM. Understanding your concern. As per your query your wife have symptoms of sudden red splotches on feet Well there can be many reasons for symptoms you mention in query like due to allergic reaction or insect bite . I would suggest you to do gentle massage , apply warm compresses or keep your arms in hot water tub with epsom salt in it , take over the counter anti histamine like benadryl and take proper rest . Consult orthopedic surgeon for proper examination . Doctor may order blood test , nerve conduction test along with physical examination . Doctor may order nerve supplement anti inflammatory and physical therapy . Doctor may refer you to neurologist for nerve problem or endocrinologist for diabetes . Hope your concern has been resolved. Get Well Soon. Best Wishes, Dr. Harry Maheshwari