As the age passed , Our Thymus gland is reduced from its initial size which is responsible for decrease in immune power, it is very small in old age that is why old person get ill rapidly but wait you are now of 23 yrs you should have strong immune system so that your body can fight from germs and disease
Next Steps
you should give up all the bad habits and start a new life , take all nutrient as per daily required calory neither less nor more
Health Tips
for ur wound follow what your doctor said