Restylane - Headache, Diarrhea?

Hello, and sorry to hear about the side effects you are experiencing. These symptoms are coincidental, and are not likely caused by your Restylane treatment. I would recommend an exam by your physician as soon as possible, as your symptoms may be caused by a separate issue that requires attention. If you are unhappy with your appearance following the treatment, it is possible to remove the Restylane with the enzyme hyaluronidase. Thank you, and I hope you feel better!

Yes, you can have Restylane removed, however, it's not likely the cause of your flu-like symptoms you say you're experiencing 4 hours after Restylane was injected. It sounds like you either have a touch of the flu or need to visit your primary care provider if your problems worsen or persist.

After treatment, you might have some swelling, redness, pain, bruising, or tenderness. These are typically mild in severity and normally last less than 7 days in nasolabial folds and less than 14 days in lips. Swelling may be more likely in patients under 36 years, and bruising may be more likely in patients over 35 years. Rarely, the doctor may inject into a blood vessel, which can damage the skin. Although rare, red or swollen small bumps may occur. If you have had facial cold sores before, an injection can cause an outbreak. Headaches and diarrhea are not commonly reported side effects of the treatment. I believe your symptoms are being caused by something other than the Restylane. I would suggest speaking with your regular physician about this issue. 

You did not mention where on your body you had Restylane injected, but I'm assuming it was somewhere on your face.  I cannot attribute the symptoms you are describing to the Restylane.  Perhaps you have a viral illness or have something else going on.  Please see your regular doctor for a complete check up.  It is possible to dissolve Restylane with Hyaluronidase, but it may not be necessary in your case.