IntroductionDermal filling for aesthetics and facial rejuvenation is one of the most common aesthetic procedures, with hyaluronic acid (HA) being the most commonly used filler due to its high safety profile. Nevertheless, adverse effects have been reported that people should be aware of before the procedure. This study aims to assess Saudi Arabians' awareness of dermal fillers, their side effects, and information sources.MethodsThis cross-sectional study used an online questionnaire to determine participants’ level of knowledge, from January 2, 2022, to February 19, 2023. Statistical analysis and ordinal logistic regression were used to assess the respondents’ knowledge of dermal fillers and other parameters.ResultsOf the 1,208 respondents, 290 reported using fillers, and 44% reported that complications were mentioned to them before the procedure. The results also showed that the primary source of information was social media (44.8%), followed by the Internet, physicians, and books. Respondents to whom physicians explained complications reported bruising, bluish discoloration at the injection site, redness, swelling, and accumulation of body cells under the skin, as discussed with them. Bruising and bluish discoloration were the significantly reported complications in people who received fillers, whereas lumps, epistaxis, ulceration/loss of skin, and swelling/accumulation were reported in those who did not receive fillers.ConclusionAlthough some adverse effects may occur with HA, its enormous advantages led to its use in facial rejuvenation. With social media as a major source of information, many respondents reported unlikely adverse effects as common ones, suggesting that information sources need to be corrected by physicians to raise awareness of the adverse effects of cosmetic procedures and enhance informed decision-making by patients.