It is safe to consume donkey-hide gelatin even if you have a teratoma; eating donkey-hide gelatin has no relationship with teratomas, and they do not affect each other. When dealing with a teratoma, it is primarily important to consider the size and volume of the teratoma, whether it has caused any symptoms, and whether it has twisted, among other issues. Some teratomas are large enough to require surgical treatment, some may become malignant, some may rupture, and others may cause endocrine issues, etc., all of which would require surgical intervention.