Could be electrolysis between the CF and the Al lug occuring there, that's why the bubbling of the paint and clearcoat starts from the tube/lug seam and outwards. Not good if the corrosion extends to under the tube and the lug, as it will start attacking the glue bond between the two.
You might be lucky and might have caught this before it got into the glued area. As the paint damage seems to have gone quite far down the the top tube and lug already, you might consider refinishing the headstock and top tube (or the whole frameset) to totally clean off what hopefully is just surface damage. Many here had already done CF/Al framesets with visible weaves with great success in the past few years. Do a search to find out how it's done. You'd be surprised how it's not such a complicated process, just a lot of elbow grease, care and patience with sanding off the clearcoat finish on the CF tubes, and polishing the Al lugs (if you want to show them off.).
BTW, the down tube at the headstock seems to have it's clearcoat finish also clouding up and possibly separating from the tube. If it is, the more reason to do a full frame refinish.....