rash from b12 injection Injecting P484 Cobalt as the culprit:
Description
Stacking them strategically produces significantly better results
However, excessive supplementation of vitamin B12 can also lead to serious consequences

What's your update after going back to see the doc

Anti-CD38-Blocked Ricin: An Immunotoxin for the Treatment of Multiple Myeloma
Intramuscular administration remains the gold standard for these conditions, as recommended by NICE and the British Society for Haematology

Peripherally, pancytopenia is most often observed, but only 1-2 of the major cell types (erythrocytes, leukocytes, platelets) may be depressed in some cases