Before deciding the treatment with dermal fillers, a number of general health aspects need to be clarified. A particular tendency to bruising, medication that thins the blood, like aspirin, warfarin or clopidogrel may also lead to significantly more bruising and swelling and needs to be known in advance. The risk or allergic reactions with current dermal fillers is very low and they do not require preliminary allergy testing. Redness, swelling and bruising at the point of injection are possible with all types of fillers, and most frequently are limited to one or two days after the treatment. More prolonged redness or swelling is possible and will been to be brought to the attention of your doctor promptly.
The risk of infection is present whenever using injectable treatments and is a consideration also with fillers. Typically, the treatment does not require an antibiotic cover, but if you have any suspicion of an infection, you need to discuss your concerns promptly with your doctor. Thorough cleaning of the skin before treatment is essential.
Pain at the injection site is usually limited, and the treatment can be carried out either using local anaesthetic cream, local anaesthetic injections or no anaesthetic depending on individual preferences.

Delayed side effects include the formation of lumps. if the Dermal Filler used is composed of Hyaluronic Acid ( Juvederm, Beltero, Teosyal, Restylane etc) this is rare and these can usually be dissolved quite easily with Hyalase. Other products such as Radiesse, Sculptra, Ellanse etc that are often promoted as longer lasting but may have an increased risk and this should be discussed with your doctor. They can often be managed medically but in very rare circumstances surgical removal may be required.