A single ankle with the leg above it can swell in gout, rheumatoid arthritis, deep vein thrombosis, trauma, fracture, ligament tear, tendonitis, bursitis or ankle strain. It can also be due to localized infection of the skin above and not be related to the joint. It is difficult to comment beyond this at this stage. You will need to follow this up with an orthopedic specialist.
X-rays will be negative for all causes except fracture. MRI of the joint may be required to locate the cause. Since there is a discoloration too, it could be deep vein thrombosis, which can be diagnosed by duplex ultrasound or color dopplar.
Please consult your PCP for primary examination followed by proper referral.
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