can b12 injections cause itchy skin Common & Rare Side Effects of Vitamin Methylcobalamin Injection (Vitamin B12) |
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Sometimes these blisters are linear in appearance

Additionally, the utilization of over-the-counter pain relievers, such as acetaminophen or ibuprofen, serves to not only reduce pain but also manage inflammation always adhere to the recommended dosage and consult a doctor if uncertainties arise

and these tend to resolve quickly

I also note that you have potential thyroid issues - lots of cross-over between thyroid/B12 deficiency symptoms - so might not be easy to sort out which symptoms are due to what
