Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concerns..
As per your complain it seems that you have a viral infection leading to cold sores and red tongue also known as Glossitis can be secondary to inflammation caused due to viral infection while it can also be a side effect of antibiotic
augmentin..
I would suggest you to start gargling with a numbing mouthwash to relieve pain in mouth.
Take
multivitamin supplements..
Take anti-inflammatory painkiller like Ibuprofen to reduce inflammation and pain..
You can do warm saline gargles..
In case if there are also cold sores caused by
Herpes Simplex Virus 1 you should also be advised to take antiviral medications like oral and topical treatment will
Acyclovir, Valacyclovir,Famicyclovir etc..
You can also do steam inhalations, sip on warm water and chew Vitamin C pellets to relieve cold symptoms..
Decongestants like
Phenylephrine and anti allergics like benadryl can also help..
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora.