There is a form of inflammatory arthritis that is associated with acne, ususally severe acne. Joints and tendon attachments can be inflammed. Interestingly, the periosteum or the surface of the bones can also be inflammed causing bone pain. Treatment is with anti-inflamamtories. I hope you are seeing a rheumatologist. The rheumatology department at Marshfield Clnic is excellent.
About Alan Matsumoto, M.D.
Part-time Faculty, Division of Rheumatology
Johns Hopkins University