It's got nothing to do with the needle. The needle shouldn't be a problem if you aim between scales. The issue is Baytril is considered highly cytotoxic and actually burns the animal..
Not to mention, Baytril for reptiles is actually an off-label use.
Common Reptile Drugs and Dosages (includes references)
Here we go:
http://www.ncbi.nlm.nih.gov/pubmed/10417589
Conclusion: This study shows that there is no benefit to the cosmetic outcome of scars by applying vitamin E after skin surgery and that the application of topical vitamin E may actually be detrimental to the cosmetic appearance of a scar. In 90% of the cases in this study, topical vitamin E either had no effect on, or actually worsened, the cosmetic appearance of scars. Of the patients studied, 33% developed a contact dermatitis to the vitamin E. Therefore we conclude that use of topical vitamin E on surgical wounds should be discouraged.
And..
http://www.scintera.com.au/Pdf/Topical Treatments For Hypertrophic Scars.pdf
In conclusion, the evidence that topical vitamin E alone improves the cosmetic
appearance of scars is poor. It is also associated with a high incidence of contact
dermatitis. The use of vitamin E should, therefore, be discouraged.
And another..
Inhibitory effects of vitamin E on collagen synthesis and wound repair.These one state that current studies are inconclusive at best, and reports are only anecdotal:
Vitamin E: Critical Review of Its Current Use in Cosmetic and Clinical Dermatology - Thiele - 2006 - Dermatologic Surgery - Wiley Online Library
Vitamin E for treating children's scars. Does it help reduce scarring?
Why don't we use vitamin E in dermatology?
A few of those are full articles. If you're a university student or otherwise have access to (medical) journal databases, you an get the full articles. They're loaded with more
references.
I've got several scars, including one which is around 30cm on my leg. I have both experimented with/without Vitamin E and haven't noticed anything at all. At best, I've put the healing down to the body's ability - nothing more.
Of course, it's hard, if not impossible, to extrapolate from data/studies on humans as to what the effect of Vitamin E may be on reptiles..