Hi there!
Well, there could be a few reasons for loss of penile sensations including psychological stress/ anxiety, depression, neurogenic disorders, medications, trauma, alcohol, smoking, drugs/medications, hormonal imbalance, radiation therapy, kidney failure, metabolic disorders, multiple sclerosis, hypertension, diabetes, prostatitis, urethritis, vascular causes etc. just to name a few. Minor trauma may play a role in temporary loss of sensations. I would suggest giving it sometime and avoiding trauma to the region. It might also be beneficial to get rid of factors like smoking/ alcohol/ drugs, if involved. If the symptoms do not seem to improve in 1-2 weeks, you may consider a detailed evaluation by a urologist for an accurate diagnosis and appropriate management.
Hope this helps.
Take care!