Why Does Erythema and Skin Warmth Happen After Restylane Injection

Restylane may cause some redness at the needle sites of insertion, and redness may be caused by bruising.  Warmth should not occur.  If a numbing cream had been applied prior to the injections, then maybe the skin is reacting to this topical cream.

Without knowing how soon you experienced this after your treatment, it's difficult to speak specifically.  If you only experienced this for a short time after your treatment, this may be a temporary reaction to the topical numbing product or the injection process itself. 

If this reaction is delayed or not resolving soon after treatments, you should report this to your practitioner for further instruction.

These signs could represent a skin infection and should be discussed with your injecting doctor.  Generally the skin settle down quickly after Restylane injections.  Typically by 24 or 48 hours, the bee stung effect is gone.  If you are describing a skin reaction beyond this time frame, it warrants bringing it to the attention of your injecting physician.

There is one more possibility that no one has mentioned.  It all depends if your surgeon used Restylane® Lidocaine.  The lidocaine itself may cause a slight vasodilation of the blood vessels and cause the erythema and mild increase in temperature in the local area.   I have seen it in patients with very fair complexions and it occurs within 5 minutes of injection and should fade over 2-3 hours.  As mentioned abouve trauma, allergic reactions and even infections are possibilities so please see your surgeon.
 

You should not really get any erythema or warmth from injection of filler to your face unless you are having a reaction to it.  You should probably check with your doctor.