Hi.. Welcome to HEALTHCARE MAGIC. I have gone through your query and can understand your concern.. As per your query a swollen lump at the back of tongue can be an inflamed circumvallate papillae secondary to throat infection and it can lead to pain and difficulty in swallowing.. There can also be other causes like formation of pyogenic granuloma secondary to infection. Nothing to worry as gradually when the infection will resolve the inflammation and swollen lump will also regress in size.. You need to consult an ENT expert and get evaluated and he can advise you to take antibiotics like Levofloxacin, anti-inflammatory painkiller like Ibuprofen, warm saline gargles, gargle with a numbing mouthwash, steam inhalations and using a humidifier in your room.. For sough you can take cough expectorant containing Guaifenesin.. Avoid spicy and hard foods and take a soft diet and plenty of warm fluids.. Take ample of rest.. Hope this information helps.. Thanks and regards. Dr.Honey Nandwani Arora.