You have mild upper eyelid ptosis. There is a compensatory eyebrow elevation. There is slightly more levator dehiscence in the left upper eyelid. While it looks like you have too much skin with an extra fold, this is here because you are missing volume in the upper eyelid fold. You did not provide old photographs, however it is likely you have a compensatory eyebrow elevation and combined with retraction of anterior orbital fat into the orbit with the levator dehiscence this area now looks depleted. Help would be in the form or an anchor blepharoplasty with a small levator advancement, a ptosis procedure. This will also encourage the eyebrow to settle back down to its normal position.
Thanks for your question and photo. It is hard to assess with an incomplete photo and no before pictures. It certainly seems like extra skin exists. MG usually gets worse as as the day progresses and is seen in both eyes and not just one eye. I would recommend an in person consultation with an eyelid specialist, plastic surgeon, facial plastic surgeon or oculoplastic surgeon. They are best suited and fixing your issue. Good Luck.
All the best,
Carlos Mata MD, MBA, FACS
Board Certified Plastic Surgeon
An ophthalmologist or Oculoplastic surgeon evaluation would provide reassurance to you, especially with the diagnoses that you mention in your post! Tumors and myasthenia produce other symptoms and are relatively rare, but if you are worried, it would be worth it to have a complete examination. Your photo is taken from approximately 15 degrees left and up - so it is difficult to say whether you have ptosis or not. Seeing an Oculoplastic surgeon would be reassuring to you, because he or she would be able to measure the ocular position in the eyesocket, check your ocular motility, and suggest options to correct the eyelid asymmetry. Best wishes!
everyone has some degree of eyelid asymmetry, it just depends on the degree of asymmetry that is present. A conservative upper eyelid, skin only blepharoplasty can address making the lids appear more symmetric