Cysts is a closed sac having distinct membrane and nearby tissues. Cysts may contain air, fluid or semisolid material.
A dermoid cyst is a cystic teratoma that contains developmentally mature skin complete with hair follicles and sweat glands.
Periorbital dermoid cysts
Dermoid cysts occur in young children, sometimes near the lateral aspect of the eyebrow (right part of the right eyebrow or left part of the left eyebrow). They are mostly rubbery in consistency. Treatment depends either you watch the cyst to regress or excise it through surgery. If dermoid cyst gets ruptured it leads to inflammatory reaction.
If they are not completely excised they reoccur themselves seen in conditions when cysts are dumbbell shaped and extends into skull through sutures.
If the dermoid cysts appear on the medial aspect, the possibility of an encephalocele becomes greater and should be considered among the differential diagnosis.
Below is the photograph of the dermoid cyst which was excised off from this patient, note that some kind of cheesy material is seen in this cyst as it was ruptured.
Below is the surgery done on this boy where excision of periorbital dermoid cyst was carried out, see the surgical steps on youtube below by Dr Rajendra Kumar Bundela from Bundela Netra Kendra & Maternity Centre, Gomti Nagar, Lucknow