My penis foreskin is too tight to pull back. Is it a serious issue?

You have Phimosis.

Phimosis or Tight fore skin is a condition in which the foreskin of the penis cannot be pulled back past the glans. A balloon-like swelling May occur under the foreskin during urination. It may result in pain during erection and intercourse. Sometimes, It may cause inflammation of the glans, known as balanitis or Balanoposthitis.

In young boys, it is normal to not be able to pull back the foreskin. In more than 90% of boys, this inability resolves by the age of seven, and in 90 % of boys by age 16. Occasionally, phimosis may be caused by an underlying scarring due to balanitis or balano prosthis or balanitis xerotica obliterans. This can typically be diagnosed by seeing scarring of the opening of the foreskin.

Treatment: Partial phimosis can be treated by stretching exercise. Steroid cream and Lignocaine gel may be used to attempt to loosen the tight skin. If this fails, circumcision may be recommended.

Complications: A potential complication of phimosis is paraphimosis, where the tight foreskin becomes trapped behind the glans.This is a serious condition and requires immediate medical or surgical intervention.