Hello, the cobblestone appearance is due to enlargement of small lymphoid collection in the throat mucosa. The lymph organs or nodes enlarged fast but reduce over few weeks. Secondly if there is some symptoms, even mild then please consult a gastroenterologist and /or get h. Pylori gastritis checked and treated.
Even allergic pharyngitis can cause cobblestone appearance for which take antihistamines with decongestants
Finally, there are so much information about reflux and lifestyle changes, pl follow for few months. Even then the cobblestone appearance may not reduce. Its ok to be like that as long as you are asymptomatic.
Next Steps
Consult a gastroenterologist first and then an ENT specialist afterwards
Health Tips
Tips for reflux :
1. Reduce spice and oil in food
2. Avoid sour foods
3. Avoid heavy meals, divide and eat
4. Avoid heavy dinner
5. Stop smoking, reduce coffee, tea is fine
6. Dinner 2 hrs before sleep