Thank you for writing to HCM.
The little curvature of erect penis is normal thing.
Hardly anyone has straight 90 degree erection.
Curvature has no effect on sexual satisfaction of partner. For example, if one has to pass inside a room through the window, it does not matter the direction of entering the window. It’s ENTRY followed by to and fro continuous movements that is important.
You can
consult general surgeon for examination of it to rule out Peyronie disease (you can read on net about this).
Masturbation is healthy part of sexual enjoyment
It is just like sexual intercourse (in fantasy) with the partner you really love. It works as a safety valve which lets you release the
sexual tension and urges.
Sexual intercourse is not BAD HABIT, so also the masturbation.
It does not cause dark spots on face or circles around eyes.
Dark spots on face may be due to independent skin disorder. You may have a checkup with
dermatologist.
Masturbation is not a disease! No medication for this.
I recommend
psychological counseling.
Wish you good health.