hi. other than protruding on her left side, how would you characterize the lump (in terms of size, texture, borders, associated signs and symptoms, aggravating and alleviating factors)? it may be just an inflammatory reaction if your grandmother is always lying on her back. it could also be due to some protein-energy malnutrition, hence, accumulation of fluid ensues. other lesion types, such as lipoma, fibroma, malignancy, must also be ruled-out. it is best if you bring her to the doctor for physical examination and clinical evaluation. diagnostics and management will be directed accordingly. hope this helps. good day!! ~dr.kaye