hi welcome to HCM
-hi i had gone through your query and understand your concerns. i would come up with the possibilities of ALLERGIC RHINITIS
are the causes for sufferings
-both conditions are allergic in nature and recurrence is common without proper treatment and management
x-ray for PNS may confirm the diagnosis of sinusitis
there is a another possibility for your red bumps and patches is,MOUTH ULCER
local examination may confirm the diagnosis.
I hope this is helpful for you, thank you