Dear Catgirl
Lip fillers have a very good record of safety - most disappear after a year or so. You can get a bump from an injection- this will be seen early- 1st week or 2. The filler may be absorbed irregularly- however unlikely and this could result in a bump over time.
Pre-cancerous lip changes show up as irregularity of the skin texture, peeling, ulceration and firmness. If you have any of these changes then you need an examination by your MD and a possible biopsy.
With Warm Regards,
Trevor M Born MD



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