I've done an F from Fine Molds and your post prompted me to have a look at it: yep, it's there for sure!
I also had a look in Prien & Rodeike "Messerschmitt Bf 109 F, G, & K Series", a book that's absolutely filled to the brim with photos. I would say that Fine Molds probably has got this reasonably right. It is hard to tell exactly what this area looks like in reality but there is some kind of "anomaly" there that can be seen in many photos and that doesn't look unlike what Fine Molds have done in their kits. I would leave it as it is or if I found it disturbing, try to smooth it out a bit with fine sand paper. But totally wrong it certainly isn't!
Hope this helps!
Magnus