Perlane is a hylauronic acid injected for facial volume. This product is usually not injected in the tear trough although I have seen good results with its use in this area occasionally. Restylane is a thinner, more forgiving product usually injected in the lower lids for volume. It is also unusual for either of these products to have a tyndall effect on the skin. A competing hyaluronic acid is manufactured differently and that product may leave a residual blue hue, but Perlane and Restylane do not. If product remains following injection f hylauronidase, you man require another treatment of hylauronidase. There are side effects to this counteraction. The main risk is the breakdown of soft tissue. This is probably the reason your physicians is cautious. The tear trough skin is thin, so this area would be at high risk for complication. I am not sure how long it has been since you were injected with hylauronidase. I recommend waiting a month and following with you physician for reassessment. Perlane is not permanent and will eventually totally resolve.