Unlike large predators, insects in dreams rarely represent a single major threat. They tend to symbolise something smaller and more persistent — the accumulation of minor stresses rather than one big one.
A swarm of insects
This is one of the most viscerally uncomfortable dream images, and it typically shows up during periods when many small stressors are piling up simultaneously rather than one large crisis. The overwhelm in the dream mirrors an overwhelm of small, nagging obligations.
Insects crawling on your skin
Often appears alongside a feeling that something in your environment or a relationship is "getting under your skin" — a persistent irritation you've been tolerating rather than addressing directly.
Killing or removing insects
This version tends to reflect an active, if incomplete, attempt to deal with the small stressors — you're managing them, even if you haven't resolved the underlying cause.