It sounds like the tumor you have dealt with is an ORBITAL HEMANGIOMA
. Removing these can be quite dangerous because normal structures behind the eye can be damaged leading to permanent loss of vision.
The cyst you describe may be one of two things:
1. Dacryocystitis - This is an infection of the lacrimal drainage system that goes from the inner aspect of the lids to the nose. This often requires treatment with antibiotics and possibly surgical intervention. In my opinion, this is the most likely diagnosis.
2. An extension of your hemangioma - This is a possibility that must be considered given your past history; however, it is unusual for the type of tumor that I believe you have to continue to expand after adequate steroid treatment.
Ultimately, there is no substitute for a complete eye exam to help identify the cause and treat appropiately. I would recommend a visit to an ophthalmologist
with a subspecialty in oculoplastics. These sub-specialits are best equiped to handle the type of situation that you are dealing with.
I hope this is helpful and good luck as you pursue an adequate cure to the condition...