If your plants have been attacked by thrips the new growth looks curled and distorted. The leaves can also turn a silvery colour. Check this article for how to treat aphids.
Thrips are very tiny slender insects with fringed wings that can be identified as tiny black specks or dots on leaves. They are greyish to brown in colour and at most a single millimetre long. If you suspect thrips it's better to check your plants using a magnifying glass (yes, they are that tiny). You can read more here on how to identify if your plants have thrips.