I am having it removed. Is the down time short?
A 4 cm lipoma is considered medium in size. Your activity may be restricted for the first couple of weeks. Ensure you choose an experienced and expert board certified plastic surgeon.
I don't consider a 4 cm lipoma on the large side. This should be removed by a simple excision with minimal discomfort and downtime. An incision will be made and sutures or some sort of closure is necessary so patients should take it easy (i.e. no gym, heavy lifting, etc.) until the incisional wound is fully healed and/or they've been cleared by their doctor. As far as going about your normal daily activities, however, there shouldn't be any restrictions. Follow your providers instructions, however, because after they examine you and perform the procedure they will likely have more specifics for you.