Can I use biocorneum on lip bump on my lip due to a dog scratch?

It truly depends on whether the scratch is on the inside of the lip or on the outside.  It is not intended for tissue inside your mouth. However, if it is on the outside then applying it twice daily would be safe.

Biocorneum does an excellent job addressing cuts and scrapes of the face.  The combination of silicone and SPF in Biocorneum help form a delicate scar over time.  Its best applied twice per day to the affected area.

BioCorneum is great for facial scarring, especially because it has an SPF in it; this will prevent the delicate skin on the face from darkening as the scar heals.

It is difficult to say without seeing your scar or examining you.  It is common for scars to be slightly raised and feel "bumpy" in the initial healing.  This is especially true for traumatic injuries.  Biocorneum will help your scar heal and mature faster.  You should wait until it heals over completely prior to starting this treatment.  Now if the scar is bumpy because it actually required sutures and was not properly treated, Biocorneum may make it a bit better, but it can have persistent irregularity that can only be managed by surgical revision or lasers/microneedling.  If you have concerns the safest bet is to have a consult with a plastic surgeon.