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Muscle knots form when muscle fibers contract and don't fully relax, creating tight, tender spotsalso called myofascial trigger points. These can develop in the muscle tissue or the fascia (the connective tissue What happens if you inject B12 wrong? CoLaz Myofascial Pain Trigger Point Injections Explained YouTube lump under skin after b12 injection lump at injection site after b12 shot Why do I get painful white bumps after injections?
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