A 2018 Italian review mentioned above also looked at studies of mud therapies for psoriatic arthritis. It says that, while only a few randomized controlled trials have been done, they've had good results.7

One of those studies, published in 2015, evaluated the effect of mud-bath therapy on people with psoriatic arthritis taking TNF-blocking medications.4

Half of the 36 participants received mud-bath therapy while continuing treatment with their TNF blocker while the others just took the medication. Results were measured in multiple ways, including the Psoriasis Area and Severity Index (PASI), ultrasound, and counts of swollen and tender joints.

Several measures revealed significant improvements in the mud-bath group that weren't experienced by the control group. Researchers concluded that mud-bath therapy is effective and appears to decrease inflammation in the joint lining in people with PsA.

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