Unable to open left eyelid completely without any pain and redness
, where the upper eyelid droops down decreasing the dimension of the eye. Ptosis is caused by various causes, which can be congenital or acquired. Since your problem is acquired for less than 5 months the cause may be acquired. Some causes like neurological or causes in the muscles of the eyelids should be ruled out. I advice you to consult eye doctor for investigations to find out the underlying cause and treatment.