What should I do if I feel a tiny drop of liquid coming out of the penis after urinating and washing, and I don't know whether it's residual urine or something else, and I'm forced to repeat Wudu' and wash my undergarment every time?

If the discharge does not exit except after urination, one must verify its cessation after urinating and washing the private parts with water, because cold water usually stops its emission. Wudu must be performed half an hour before prayer after ensuring the cessation of any trace of urine. However, if the discharge continues for hours after urination, it is considered سلس (urinary incontinence), and the ruling for its owner is like that of someone who experiences constant (incontinence).