Hi Momarti5, Thank you for your question about a "lump" under your skin after your arm lift. Your question is difficult to answer without pictures or a physical examination. The lump may be one of three things. First, the lump could be just normal scar tissue. Second, the lump could be scar tissue around the dissolving suture. Depending on the exact type of suture, absorbable sutures take several months to dissolve. Third, the lump could be a seroma. A seroma is a fluid filled pocket that is not uncommon after an arm lift. Post-operative arm lift seromas develop typically around the elbow. Usually, seromas are treated with needle aspiration. Needle aspiration is done in the office and may have to be done several times before complete resolution. I would advise you follow up with your plastic surgeon regarding this "lump". Scars are treated conservatively whereas seromas might require needling. Thank you for your questions regarding a "lump" under your skin after your arm lift procedure. If you have any more questions regarding arm lift, arm reduction, arm liposuction, brachioplasty, or any other plastic surgery procedure, please contact my office. Sincerely, Dr. Katzen.