Sunscreen pills into little white balls over my moisturiser every morning Sunscreen

Pilling is a layering problem, not a product quality problem, and there are three levers.

Wait time first. Most people give it 30 seconds and a humectant serum needs three to five minutes to actually absorb rather than sit as a film.

Quantity second. Hyaluronic serums are the worst offender for over-application. Four drops does nothing more than two.

Third, stop rubbing the sunscreen in. Press and pat it on in sections. The rolling is your fingers shearing the layer underneath.

If all three fail, that specific pair is incompatible, usually a silicone-heavy sunscreen over a gel, and swapping one is the fix.

Hyaluronic acid on properly dry skin in a dry heated room can also feel tight and sit on the surface instead of absorbing. Applying it to damp skin and sealing with the moisturiser, rather than layering on dry, makes a real difference to whether it goes anywhere.

Blunt option: you probably don't need the serum. Hyaluronic acid works by holding water at the surface and a decent moisturiser is already doing most of that. I dropped mine and noticed nothing except that my sunscreen stopped pilling.

Also scan for film formers. Anything with a carbomer or an ingredient ending in crosspolymer high in the list tends to roll under almost anything, and they turn up in serums and primers constantly.