What the evidence says
Mayo Clinic notes that topical NSAIDs have a stronger evidence base than many other topical pain products and are commonly used for osteoarthritis in joints near the skin.
Not risk-free
Topical application can reduce some systemic exposure compared with oral NSAIDs, but diclofenac still has warnings and contraindications. Follow the product label and ask a clinician or pharmacist if you have medical conditions or take interacting medicines.
How it compares with Balmorex
Balmorex is not a diclofenac product. Comparing them is a comparison between different topical categories, not two versions of the same treatment.