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Regarding your question

What are the treatments for Rheumatoid arthritis (swelling of knee with rash)?

1.Increase the fluid intake 
2.Disease modifying anti rhumatic drugs (DMARDS)
3.Gold salts
4.Corticosteroids such as prednisolone
5.Immunosupressive therapy
6.Ointment to decrease the rash as bepanthen

What are the causes of Rheumatoid arthritis?

1.Genetic Factor
2.Positive Reumatoid Factor
3.Infections
4.decrease in the immune system

What are the associated symptoms for rheumatoid arthritis?

1.Fever 
2.Rash 
3.swelling of the joint
4.Loss of appetite and weight loss
5.Increase in warmth of the joint

What are the investigations for Rheumatoid arthritis?

1.Clinical assessment at the nearest medical center
2.Check the erythrocyte sidementation rate(ESR)
3.Check the C-Reactive Protein
4.Check the rheumatoid factor 
5.check the anti cyclic citrullinated peptide (CCP)
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