Swollen lump under beak

[Ellieschickies]

My young hen who is still laying, eating, drinking and playing in the garden had developed a lump under her beak. I have only noticed this today but it may have come on later last night after they went to bed.

Does anyone had any ideas what the cause may be and how I should treat this?

Thank you in advance

 

[Ellieschickies]

UPDATE: she has drips from her beak after taking a drink of water