Contrary to popular belief, sensitive skin is not a single fixed “skin type” but an umbrella term for skin that reacts more readily than the average person’s to environmental triggers, skincare products, or clinical treatments, due to a compromised barrier or heightened nerve response.
Clinically, skin is distinguished between two broad categories: clinically reactive, and generally sensitive.
While general sensitivity refers to a skin tolerance issue where normal-looking skin more easily stings, flushes and overreacts without an underlying condition, clinically reactive conditions generally refer to diagnosed conditions like rosacea, eczema, or psoriasis that cause chronic inflammation.
Knowing which category you fall into matters as it directly influences which dermal fillers are suitable for you, and whether you should address any underlying skin concerns before proceeding.
Animal-derived collagen fillers (e.g. bovine or marine collagen) carry higher allergy risks – as well as disease risks and batch instability. These fillers have largely been phased out in popularity for HA fillers.
Permanent and semi-permanent fillers are now used selectively in modern aesthetic practice due to the risks of long-term complications, such as chronic inflammation, which can be particularly problematic if skin already tends to react. These include Polymethyl methacrylate (PMMA) microsphere fillers and older liquid silicone-based products.
Biostimulatory fillers, such as Calcium hydroxylapatite (CaHA) or poly‑L‑lactic acid (PLLA), work by triggering a controlled foreign-body response to stimulate collagen, which may increase the risk of flare-like reactions, particularly if injected too superficially or in high volumes. They are also irreversible, making it a less forgiving option if a reaction were to occur.
