The wound doesn't need treatment.

Podocarpus microphylla bonsai, alias Podocarpus microphylla, also known as Ctenopharyngodon idellus, Podocarpus pinnatifida and Taxodium brevifolia, is shrub-like, with short and dense leaves, mostly at the top of branchlets, and white powder on the back. It is a small tree or shrub with short and dense leaves, swaying branches and leaves, ancient and exquisite, and moving posture. During the growing season, new buds sprout, and their light green leaves are dotted with dense green leaves. Quite beautiful, it is an excellent material for making bonsai, especially suitable for making miniature basin shadows. Podocarpus brevifolia, also known as Podocarpus microphylla and Taxodium ascendens, is often shrubby.