Thank you for the photo - you have aphids on your plants. These soft-bodied insects suck the juice from stems and leaves, causing puckering and curling of foliage. They are easy to control. You can use your finger to squish them along the stems and new growth, and wash them off with mild soap and water. Repeat every week for three weeks, rinsing with water, as aphids leave behind eggs. There are also insecticidal soap sprays made for houseplants sold at nurseries and home center stores. Just read the label to see if they work on aphids and whether the spray is made for indoor use. Keep growing, Marianne Binetti