You'll need to send it to a lens repair service. Do not attempt to disassemble the lens yourself; you'll only make the problem worse and may damage the lens beyond repair.
SOURCE: dirt inside back lens element
The dirt has gotten onto the front element of the rear lens group. You do not want to try partially disassembling the lens to clean it. Either Tamron or a good camera lens repair technician should be able to perform what is called a partial internal CLA (cleaning, lubrication and adjustment) of just rear portions of the lens for fairly cheap. Alternatively you may be able to pick up a used Tamron 28-200 in excellent condition for less than the repair cost of your current lens. If successful, then you could turn around and sell your 28-200 for parts or sell it to someone who knows how to service it.
SOURCE: I have a Nikon D90
If it's inbetween the lens elements, there's no way you can get at it. It would have to be taken apart by a service facility recommended by the manufacturer.
SOURCE: How to remove fungus inside inner Tamron's lens
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