hello and welcome to Health care magic,
I am Dr Sriram Nathan and I shall try to help you out with your problem
The white line around tonsils and red spots on the palate
since is of a short duration can be due to many causes most of which are begnign and harmless so you do not have anything to worry about.
You may start a course of antibiotic like amox-clav along with an anti reflux medication
. Your doctor will know about these.
Take only non spicy, non oily and warm food and fluids
Look out for any dentures or teeth which is potruded and may be impinging on the said area
Take a course of multivitamin
in consultation with your doctor
If you do not get better in a week or so then you must consult an ENT doctor who may advice further course of action which may include throat swab and upper GI endoscopy
take care and do not worry
Dr Sriram Nathan