[English]
‘The boy stood on the burning deck
Picking his nose quite bad.
He rolled bits into little balls
And flicked them at his Dad‘.

Yes, and you’ve probably seen and heard worse,
One reference is in the quite naughty rhyme that has a young man asking permission to progressively touch the body parts of a new girl-friend:

‘Touched her on her nose, that’s my share.
That’s my snotter-box and you can play there‘.

As a kid, both sleeves of my school jacket had mucous trails on them. My mother was disgusted, but had stopped providing me with hankies, because I lost them, and they cost money. (No tissues back then)
A common sight on Gateshead High Street was to see an old man, standing on the kerb of the pavement, holding the top of his nose, and blowing streams of it, into the road.
Having been a City dweller for many years, I never suffered from ‘Hay-fever’, as it was known. Now, here in the foothills of The Serra De Lousa, in Portugal, a large part of the year brings on incessant bouts of nose dripping and requires the purchase of large quantities of paper tissues.
The ‘results’ if examined visually, are usually completely clear. No I can’t see the myriad spores of pollen and other irritants such as fungi etc.

The BBC recently published an article which is quite informative, and has some amusing artwork also. Look here: What your snot can reveal about your health

A Portuguese translation will be done a little later, but the verse, being idiomatic, will be omitted.
Será feita uma tradução para português um pouco mais tarde, mas o verso, por ser idiomático, será omitido.