Hello, I need some clarification on the role of ever use of tabs Erythromycin as a possible predisposing factor to the development of multiple myeloma as documented in a US based research. I am worried because I become symptomatic after a five day course of erythromycin in February 2024 for an upper respiratory tract infection URTI. The URTI treatment was followed by a localised area of skin depigmentation on the face and a bout of shingle infection and ever since then muscle soreness, bone pain and tiredness have persist. I was never symptomatic, blood test as of October 2024 still shows: M-spike of 8.7g/l (0.87g/dl) and kappa lamda ratio of 2.66. Pet-ct scan in August 2024 showed no active lytic bone lesion. Bone marrow biopsy on September 2nd 2024 showed 5% plasma cells, sample was not enough to carry out FISH analysis according to my consultant Has the link between ever use of erythromycin to cause multiple myeloma been proven. Has anyone else experienced similar issues. Thank you