So, if its mild and slow and not over time increasing and/or from puberty, then the curve is just a natural variation in the physiology or the result of a mild injury etc. Sometimes circs can pulll a curve the way the scarring happend. But, these are not healthy normal things below from Mayo and not to scare anyone but if the curve keeps deepening inhibiting erection and/or hurting or making fucking ass or pussy hard, then you may want to see a doctor.
Mayo Clinic Website:
When you become sexually aroused, blood flows into spongelike spaces inside your penis, expanding and stiffening it. A bent penis generally occurs when these spaces don't expand evenly. Most often, this is due to normal differences in penis anatomy, but sometimes scar tissue or another problem causes a bent penis and painful erections.
Possible underlying causes of a bent penis include:
Peyronie's disease (a curved erection caused by one of a number of underlying conditions)
Injury to the penis
Autoimmune disorders
Inherited fibrous tissue (collagen) abnormality
Be aware, be observant, love your cock and yourself and see a doctor when in doubt and a penis doctor not a GP they know fuck all.