My friend had a fever and difficulty breathing 3 weeks ago. she has since developed a rash, especially around her joints and very achy joints.?

Needs to be seen: Many things can cause these symptoms, and most are temporary and nothing to worry about. However, many other things are worrrisome that can caus this, such as infection (tick tillnesses, toxic shock syndrome, etc) and rheumatological problems (lupus, rheumatoid arthritis, erythema nodosum, sarcoid, etc). To be sure, see a dr. To get some testing.

Autoimmune disease: This can be a sign of numerous diseases. This can vary from a self limited viral infection to a serious life threatening autoimmune disease. Your friend should see a physician.

Rheumatic fever?: Dr. Neilsen provides sound advice. Another infection to consider is streptococcal pharyngitis and post-streptococcal rheumatic fever. She has 2 of 4 symptoms necessary for diagnosis - rash and arthritis.