Hello, My sister started with little red places on her arms and thought they were bug bites. Then they became larger areas. She developed fever, extreme fatigue, joint swelling - even her toes feel like pillows but are not as swollen as that, she also can not make a fist because her hands & fingers are that swollen. She is guessing it is fifth disease. It is not measles. Dr did take some blood but says results take two weeks! From early Dec through Feb, her husband had a strep infection that got into his blood. He has been under the care of a Dr. For this but was hospitalized for 2 weeks. Could she have caught this from him now even though he's been better?