This is a minimally invasive procedure with real risks, and your director goes through them with you while you still have the option to decline. Bruising, swelling and tenderness along the treated limb are expected in the opening days, together with patches of altered sensation that take weeks to normalise. Less frequently patients develop surface irregularity, firm nodules under the skin, a fluid collection, skin laxity, infection at the micro-entry point, or asymmetry between left and right.
A limb has its own quirks. It is narrow and constantly in view from every angle, so a small irregularity reads more loudly than the same irregularity on a trunk. The inner surface sits close to the armpit and numbness lingers longest there. A sleeve worn loosely, or abandoned early because it is warm, lets fluid gather exactly where nobody wants it.
Tell the clinic your full medical history, every medication and supplement, any previous surgery near the armpit or chest, and any past reaction to anaesthetic. Afterwards, keep the entry points clean and dry and contact the clinic promptly if pain, redness, discharge or swelling grows after the first few days. A resident medical director is on site through opening hours, so somebody qualified can look at the arm.