Can predispose to infections, foul odors, (rare cancers), stds, and the like.
Phimosis is usually attributed to fungal infection
of end of foreskin
. Can be stretched (see: http://www.Glanspro.Com/ -- good luck!), or better answer is with urology
consult for improvement in situation. Can cause paraphimosis
problem if meatus (/"head") gets caught out ("strangulated by foreskin) when erect.