u/Bakendorf

https://preview.redd.it/mvyiqyr9yqxg1.png?width=1899&format=png&auto=webp&s=119b0610c8e9b0ea1b5f57f2dce6822c679245d7

Been working on this sculpt, I mirrored it and have been getting weird overlapping patches, friend told me to hit Shift+F and it looks like this... this cannot be good, what could be causing this?