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When collagen builds up under the skin, it may thicken and form a tight cord under the skin

Tell your health care provider right away if you get symptoms which may include: pain in your upper stomach (abdomen), fever, yellowing of the skin or eyes (jaundice), or clay-colored stools food or liquid getting into the lungs during surgery or other procedures that use anesthesia or deep sleepiness (deep sedation)
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[DOI] [PMC free article] [PubMed] [Google Scholar] 154.Franssen, L

Studies suggest there is no difference in efficacy between the different delivery methods
