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The CT finding is suggestive of left maxillary sinusitis
for which you need antibiotics and possible drainage procedure if it is chronic, which explains the headaches. Subcutaneous lipoma is common in public, not to worry about them, get those removed which bother you or are cosmetically disfuguring. Necrobiosis lipoidica
is associated with Diabetes mellitus
, Rheumatoid arthritis
and Sarcoidosis. You could be having infection which can be due to possible Diabetes. Please get your blood sugar checked. The forehead depression could be congenital and not significant. Lowering of lymphocytes could be due to associated immune disorder like HIV, Rheumatoid arthritis or Sarcoidosis. Get checked for the above mentioned. You are at risk for immune suppression which explains even sinusitis. Avoid fatty, sett, high carbohydrate
diet. Eat plenty of fresh fruits and green leafy vegetables. Drink enough water. Exercise daily. Consult your Doctor to evaluate you on the above mentioned pathology for your benefit.