Hi there, it sounds like there was a tear of part of the foreskin. Tears commonly happen with the frenulum. The frenulum is the stretchy band of skin that attaches the foreskin to the underside of the shaft of the penis. This area is very sensitive and bleeds easily when torn.  Tears can happen to any man. To help heal the tear, keep the area clean and dry. Most often, the tear heals on its own without problems. You can use an antibiotic cream, but it is often not needed. Also, do see your healthcare provider right away if it does not seem to be healing and/or you have signs of infection (redness, pain, pus).
It is common to tear the frenulum during masturbation and sexual intercourse. If the area tears over and over, scar tissue can form making the frenulum less stretchy. This in turn makes it more likely to tear again. To prevent tearing, you may have to take it slowly with masturbation and intercourse. Use a good lube to lower the chances of tearing. Also, using condoms is a good idea to protect the area until it is healed.
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Health Nurse