There is no need to be overly rigid over this issue.

It is best to keep it simple: The purpose of circumcision is to remove the foreskin or the fold of skin that covers the head of the penis. As long it is removed, the requirement is fulfilled. There are physicians who practice this on a regular basis; so you should trust them as there is no need to be overly worried about it.

The Prophet (peace be upon him) said, “This religion of ours is fairly simple and easy to follow; whoever makes it rigid only be defeating himself (by such an attitude.” He further said, “Woe to those who are rigid in practice of their religion – he repeated the words thrice.”