Do you use any contraceptive creams or ointments?
The saws are signs of irritation and the reason for them is unknown.
I would suggest you visit a doctor for him to examine the scabs which are formed.
i had lost my virginity 1 day ago n i have bruises and blister on my penis n it is swollen n feels very sensitive to any touch or contact is those feelings going to go away or stay
the reason for what you are feeling is simple. Your penis is just not used too the sensation and the irritation and etc. should go away soon.
However if it returns then you might need to talk with your urologist on the matter as increased sensitivity might be caused by other factors.