My chest tube scar is still so painfull why is this?

It's different: Chest tube openings are not closed like a normal wound would be. The healing is between different layers of completely different tissues. There may be quite a bit of inflammation present even in the rib itself. If this is a recent wound, i.e. Less than three months, take something like advil (ibuprofen) for the discomfort and use warm, moist heat placed over the wound. It should help. Let your surgeon see yo.

Fibrotic scar: I'm sorry to hear about this but a chest scar will take time to heal along its tract. A tethering sensation is not uncommon for as minimum of six weeks before it begins to soften and relax. This may cause discomfort particularly with coughing. Gentle massage to promote scar maturation may help. If hypertrophic, steroid injections may help as well.

How long : Has it been out? If early it could still be inflammation. If late it can be thickened scar tissue around nerves or neuromas. Lots of nerves sit by the ribs so it can take a while. Also placing a chest tube is done by creating a hole through the muscle as well. This muscle healing may take time too.

Hypertrophic??`: If a scar has become hypertrophic or has become a keloid scar, they can become quite painful. One should have their doctor evaluate this. Sometimes a local steroid injection into the area can be effective.