Hi , and thanks for your post and question, it's a good one. You may be aware we cannot provide medical advice or diagnostics over the internet (for your own safety), but your concern certainly warrants a reply.
It is highly unlikely that a bulge in one's inner thigh area is related to the bloating that is often associated with COPD.
However, having said that, a bulge that is impinging on one's muscles and is painful, too, may call for an assessment and evaluation.
Would you consider bringing this to the attention of your doctor. If you are mentioning it here within the community, it is clearly on your mind and troublesome, too. You may want to have it looked at by a physician who knows your medical history.
What do you think?
Leon L (author/moderator)