hello Thanks for query . You have sustained abrasion of penile skin due to dry and rough shaking of your penis while masturbating resulting into raw sore over penis , You need to take broad spectrum antibiotic like Cefotaxime along with anti inflammatory drug like Diclofenac twice daily along with Ensure to wash your genitals with warm water and Betadine twice daily and apply topical antibiotic ointment like Neosporin twice daily..Cover it (Dress it) with sterile dressing to avoid contamination with cloths and getting infected . Ensure to avoid sexual encounters till it heals up completely. It should get healed up within a week . Dr.patil.