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Restylane is produced by Q-Med.
Restylane is most commonly used for lip enhancement (volume and contouring). It is used to diminish wrinkles and aging lines of the face such as the nasolabial folds (nose to mouth lines) and melomental folds (sad mouth corners). It may also be used for filling aging-related facial hollows and "orbital troughs" (under and around the eyes), as well as for cheek volume and contouring of the chin, lips and nose.
A treatment with a dermal filler like Restylane can cause some temporary bruising in addition to swelling and numbness for a few days. In rare cases there has been reports of lumps or granulomas. These side effects can be easily reversed with a treatment of hyaluronidase, which is an enzyme that speeds up the natural degradation of the injected hyaluronic acid filler.
Several studies have been done to understand the long-term side effects of restylane and other hyaluronic acid fillers. In certain cases, the filler results in a granulomatous foreign body reaction.
Even though side effects are rare Restylane should not be used in or near areas where there is or has been skin disease, inflammation or related conditions. Restylane has not been tested in pregnant or breast-feeding women.
Most injectors inject the filler with a small needle under the skin. Numbing creams or injections decrease pain.
A new way to use Restylane was described in the August 2007 issue of the Journal of Drugs in Dermatology by Dutch cosmetic doctor Tom van Eijk, whose "fern pattern" injection technique aims to restore dermal elasticity rather than to fill underneath the wrinkles. 
- FDA approval
- Frequently Asked Questions - Restylane USA
- Restylane Information
- Edwards, PC; Fantasia, JE (2007). "Review of long-term adverse effects associated with the use of chemically-modified animal and nonanimal source hyaluronic acid dermal fillers". Clinical Interventions in Aging. 2 (4): 509–19. doi:10.2147/cia.s382. PMC 2686337. PMID 18225451.
- Beer, K; Avelar, R (November 2014). "Relationship between delayed reactions to dermal fillers and biofilms: facts and considerations". Dermatologic Surgery. 40 (11): 1175–9. doi:10.1097/01.dss.0000452646.76270.53. PMID 25207761.
- Van Eijk, Tom; Braun, M. (2007). "A Novel Method to Inject Hyaluronic Acid: The Fern Pattern Technique". Journal of Drugs in Dermatology. 6 (8): 805–8. PMID 17763611.