What is the bubble on the scar tissue?

I do not have your complete history but coughing up blood after a TT is a medical emergency.  It may indicate you have a pulmonary embolism which is very dangerous.  Other potential problems are pneumonia, pneumothorax, fat emboli syndrome.All of these should be evaluated immediately....

This is an unusually large area of full thickness skin loss, rarely seen in cosmetic surgery. The reason is poor vascular flow to this area, whatever the cause. Your surgeon is right, that this large area to be healed in fairly short time (weeks) would require a wound vac system. This means,...

Unfortunately scarring is somewhat unpredictable and it's management can be challenging.  Radiation treatment can be very effective for problematic keloid scarring.  The procedure involves surgical excision followed by three radiation treatments in consecutive days, typically starting...

Pain at the drain site may be due to the weight of the drain pulling on the skin.  You might try moving the drain bulb.  You should ask your surgeon what he suggests in terms of topical medications to help.  Many of us do not use drains after tummy tuck to help patients avoid this...

Thank you for your pictures. If you have a point where this seroma is draining it really depends on how much of the seroma is left internally whether something else needs to be done. An examination by your plastic surgeon here in the states will lead you down the right path of treatment.

The fatty pooch that you refer to is normally a hysterectomy scar that tightly bound down to deeper tissue with fat and skin piling up above the scar tissue, leading to an overhang.  Obviously, a tummy tuck would remove this and other skin and soft tissue above it.  However, if this is...