Are dirty paws a bad sign?

[Lemon]

I’ve been looking at hamsters up for adoption and one of them looks young and small but its front paws are a little dirty. Is this a sign of some illness or can that just happen sometimes?

I’ve never seen any of my hamsters with their paws dirty

[SKB_Hamsters]

What do mean by dirty paws? Muddy looking from substrate as coco fibre can cause paws to get dirty or do you mean it looks like dried nasal discharge/snot - as this could potentially be a sign of a respiratory issue.

[Lemon]

It was brown muddy looking, but her substrate was kinda tan so idk

Definitely not nasal discharge though