What are phimosis, paraphimosis?

Can be an emergency. Phimosis refers to narrowing of the foreskin so that it cannot be retracted over the glans penis (head). Paraphimosis is the state in which a narrowed prepuce, foreskin, is forcibly retracted over the glans and now cannot be un-retracted. If the prepuce opening is too small, it may block the blood supply to the glans, necessitating emergent surgical correction. Phimosis - needs circumcision.