I can understand why you’re connecting the right-sided under-eye bag with your sinus problems, allergies, and deviated septum, especially since it is noticeably worse on one side. Those conditions can contribute to puffiness around the eyes, but they are usually not the only explanation for a persistent, localized under-eye bag. Allergies can cause swelling of the eyelids and the tissues around the eyes, and chronic nasal congestion can sometimes make the under-eye area look darker or more puffy, particularly in the morning. However, when one side remains consistently more prominent than the other, I also think about differences in the underlying anatomy of the lower eyelid. In many people, a unilateral under-eye bag is caused by slightly more prominent lower eyelid fat on that side, a deeper tear trough next to the fat pad, or mild asymmetry in the cheek support beneath the eye. Sinus disease may make the area appear worse at times, but it usually does not create a permanent, well-defined under-eye bag by itself. For hiding or minimizing the appearance, a few conservative measures can help: Cold compresses for 5–10 minutes, especially in the morning. Sleeping with your head slightly elevated to reduce overnight fluid accumulation. Consistent treatment of allergies (antihistamines, nasal steroid sprays, saline rinses if recommended by your physician). A peach- or salmon-toned corrector can help if there is also shadowing or dark discoloration. If the puffiness is truly related to fluid retention, it will usually fluctuate—often worse after poor sleep, high salt intake, alcohol, allergy flares, or sinus congestion. If it looks about the same every day, that makes a structural cause more likely. For non-surgical cosmetic improvement, the most effective options depend on what is creating the asymmetry: If there is a hollow next to the bag, carefully placed cheek or tear trough filler may reduce the contrast and make the bag less noticeable. If the issue is prominent fat protrusion, filler must be used very cautiously because it can sometimes make the puffiness look worse. Treatments that improve skin tightening (such as radiofrequency microneedling or certain laser treatments) may provide modest improvement if there is mild skin laxity, but they will not remove a significant fat pad. Because you mention a deviated septum and chronic sinus symptoms, it may also be worthwhile to have the nasal and sinus issues evaluated separately by an ENT specialist, particularly if you have congestion, facial pressure, recurrent sinus infections, or worsening swelling during allergy flares. Treating the underlying nasal obstruction can improve overall facial comfort and sometimes reduce intermittent puffiness. Based on your description, I would not assume that the bag is purely caused by sinus fluid, even though your allergies may be contributing to its visibility. The fact that the left side looks normal suggests there is likely some degree of natural lower-eyelid asymmetry or fat prominence on the right side. The good news is that this is a very common concern, and there are both conservative and cosmetic approaches that can make the asymmetry much less noticeable without necessarily requiring surgery.