If a male Sugar Glider is not neutered, they will develop a greasy sort of “bald” spot on their forehead as they begin to enter puberty (usually starting around 8-12 months of age).
This is completely normal, and it is one of three scent glands used by the male to mark his mate, his offspring, and his territory. The other two scent glands are located: A) in the center of his chest – and B) near his genital area.
When fed the correct diet of pelleted food and fruits/vegetables, this “marking” usually does not result in an offensive odor. However, males with extremely strong “glandular” systems can sometimes still exude a noticeable smell for short periods.
Once the male reaches puberty, these spots will not go away unless it is neutered; in which case:
Although it can be done at any time, if considering neutering, the best time to do it is before the male reaches full sexual maturity.